The White Rose of York (Latinised as rosa alba, blazoned as a rose argent) is a white heraldic rose which was adopted in the 14th century as a heraldic badge of the royal House of York. In modern times it is used more broadly as a symbol of Yorkshire. 
The symbolism of the white rose has religious connotations as (like the white lily) it represents the purity of the Virgin Mary, one of whose many titles in the Roman Catholic faith is the Mystical Rose of Heaven.  In Christian liturgical iconography white is the symbol of light, typifying innocence, purity, joy and glory. 
The white rose was first adopted as a heraldic badge by Edmund of Langley, 1st Duke of York (1341–1402), the fourth surviving son of King Edward III of England.  One of his elder brothers, John of Gaunt, 1st Duke of Lancaster (1340–1399) adopted a red rose as a heraldic badge, the red rose of Lancaster. Their respective descendants fought for control of the throne of England during several decades of civil warfare, which became known as the Wars of the Roses, after the badges of the two competing cadet royal houses.
The Wars of the Roses were ended by King Henry VII of England who, upon marrying Elizabeth of York, symbolically but not politically, united the White and Red Roses to create the Tudor Rose, the symbol of the English Monarchy. In the late 17th century the Jacobites took up the White Rose of York as their emblem, celebrating "White Rose Day" on 10 June, the anniversary of the birth of The Old Pretender in 1688. 
At the Battle of Minden in Prussia on 1 August 1759, Yorkshiremen of the 51st Regiment (predecessor of the King's Own Yorkshire Light Infantry) picked white roses from bushes near to the battlefields and stuck them in their coats as a tribute to their fallen comrades.   Yorkshire Day is held on this date each year. 
When in 2015 the body of the last Yorkist King Richard III (killed by the forces of the future King Henry VII at the Battle of Bosworth in 1485) was re-discovered buried in the City of Leicester, it was re-interred in Leicester Cathedral on 26 March 2015 with a white rose engraved on the new coffin, which was made by Michael Ibsen, a distant relative of the king, whose DNA helped to prove his identity.
The flag of Yorkshire is a White Rose on a blue background.  The flags of the three ridings also display it prominently.   
More than 20 civic entities in Yorkshire have a coat of arms which includes the rose of York. 
In heraldry The Rose of York is blazoned as A rose argent barbed and seeded proper (a white rose with sepals and seeds in their natural colours).  According to the College of Heralds, the heraldic rose may be used with either a petal at the top or if slightly rotated with a sepal at the top.  Traditionally the rose is displayed with a petal at the top in the North Riding and West Riding but with a sepal at the top in the East Riding of Yorkshire. 
The Yorkshire Party, a devolutionist political party with elected representatives active in Yorkshire, uses a stylised White Rose of York as their emblem. 
The Yorkist rose is used in the seal of the City of York, Pennsylvania, which is known as "White Rose City". The town's minor league baseball team, which played in different leagues for several decades, was called the York White Roses.
The white rose appears on one of the hats for York's current minor league baseball team, the York Revolution. The hats are worn during War of the Roses games versus the Red Rose City, the Lancaster Barnstormers.
The York Rose features on the shield of Canada's York University.
The York Rose also features in the emblem of Lenana School, a tier-one High School in Nairobi, Kenya. Lenana School was formerly known as Duke of York School.
Queens County, New York uses the white and red rose on the county flag and was named after Catherine of Braganza, spouse of King Charles II who in 1664 sent a fleet to recapture New Amsterdam from the Dutch; the city was renamed "New York" after James, Duke of York, younger brother of King Charles II who succeeded him as King James II.
Heraldry is a discipline relating to the design, display and study of armorial bearings, as well as related disciplines, such as vexillology, together with the study of ceremony, rank and pedigree. Armory, the best-known branch of heraldry, concerns the design and transmission of the heraldic achievement. The achievement, or armorial bearings usually includes a coat of arms on a shield, helmet and crest, together with any accompanying devices, such as supporters, badges, heraldic banners and mottoes.
The House of York was a cadet branch of the English royal House of Plantagenet. Three of its members became kings of England in the late 15th century. The House of York descended in the male line from Edmund of Langley, 1st Duke of York, the fourth surviving son of Edward III. In time, it also represented Edward III's senior line, when an heir of York married the heiress-descendant of Lionel, Duke of Clarence, Edward III's second surviving son. It is based on these descents that they claimed the English crown. Compared with its rival, the House of Lancaster, it had a superior claim to the throne of England according to cognatic primogeniture, but an inferior claim according to agnatic primogeniture. The reign of this dynasty ended with the death of Richard III of England at the Battle of Bosworth Field in 1485. It became extinct in the male line with the death of Edward Plantagenet, 17th Earl of Warwick, in 1499.
The coat of arms of Prince Edward Island was begun when the shield and motto in the achievement were granted in 1905 by royal warrant of the King Edward VII.
The coat of arms of Saskatchewan is the heraldic symbol representing the Canadian province of Saskatchewan.
The coat of arms of Nova Scotia is the heraldic symbol representing the Canadian province of Nova Scotia. It is the oldest provincial achievement of arms in Canada, and the oldest British coat of arms in use outside Great Britain. It is blazoned as follows: Argent, a saltire azure charged with an escutcheon of the Royal Arms of Scotland.
The coat of arms of Finland is a crowned lion on a red field, the right foreleg replaced with an armoured human arm brandishing a sword, trampling on a sabre with the hindpaws. The coat of arms was originally created around the year 1580.
The Red Rose of Lancaster was the heraldic badge adopted by the royal House of Lancaster in the 14th century. In modern times it symbolises the county of Lancashire. The exact species or cultivar which it represents is thought to be Rosa gallica officinalis.
The Tudor rose is the traditional floral heraldic emblem of England and takes its name and origins from the House of Tudor, which united the House of Lancaster and the House of York. The Tudor rose consists of five white inner petals, representing the House of York, and five red outer petals to represent the House of Lancaster.
A heraldic badge, emblem, impresa, device, or personal device worn as a badge indicates allegiance to, or the property of, an individual, family or corporate body. Medieval forms are usually called a livery badge, and also a cognizance. They are para-heraldic, not necessarily using elements from the coat of arms of the person or family they represent, though many do, often taking the crest or supporters. Their use is more flexible than that of arms proper.
The Prince of Wales's feathers is the heraldic badge of the Prince of Wales, during the use of the title by the English and later British monarchy. It consists of three white ostrich feathers emerging from a gold coronet. A ribbon below the coronet bears the motto Ich dien. As well as being used in royal heraldry, the badge is sometimes used to symbolise Wales, particularly in Welsh rugby union and Welsh regiments of the British Army.
The coat of arms of Ireland is blazoned as Azure a harp Or, stringed Argent. These arms have long been Ireland's heraldic emblem. References to them as being the arms of the king of Ireland can be found as early as the 13th century. These arms were adopted by Henry VIII of England when he ended the period of Lordship of Ireland and declared Ireland to be a kingdom again in 1541. When the crowns of England, Scotland and Ireland were united in 1603, they were integrated into the unified royal coat of arms of kingdoms of England, Scotland and Ireland. The harp was adopted as the emblem of the Irish Free State when it separated from the United Kingdom in 1922. They were registered as the arms of Ireland with the Chief Herald of Ireland on 9 November 1945.
The first coat of arms of Montreal was designed by Jacques Viger, the first mayor of Montreal, and adopted in 1833 by the city councillors. Modifications were made some one hundred five years later and adopted on 21 March 1938, and again on 13 September 2017, resulting in the version currently in use. The coat of arms was the only city emblem representing Montreal until 1981, when a stylized logo was developed for common daily use, reserving the coat of arms for ceremonial occasions.
A Royal Badge for Wales was approved in May 2008. It is based on the arms borne by the thirteenth-century Welsh prince Llywelyn the Great, with the addition of St Edward's Crown atop a continuous scroll which, together with a wreath consisting of the plant emblems of the four countries of the United Kingdom, surrounds the shield. The motto which appears on the scroll, PLEIDIOL WYF I'M GWLAD, is taken from the National Anthem of Wales and is also found on the Welsh designs for £1 coins minted from 1985 until 2000. The badge formerly appeared on the covers of Assembly Measures; since the 2011 referendum, it now appears on the cover of Acts passed by the Senedd and its escutcheon, ribbon and motto are depicted on the Welsh Seal.
Portuguese heraldry encompasses the modern and historic traditions of heraldry in Portugal and the Portuguese Empire. Portuguese heraldry is part of the larger Iberian tradition of heraldry, one of the major schools of heraldic tradition, and grants coats of arms to individuals, cities, Portuguese colonies, and other institutions. Heraldry has been practiced in Portugal at least since the 11th century, however it only became standardized and popularized in the 16th century, during the reign of King Manuel I of Portugal, who created the first heraldic ordinances in the country. Like in other Iberian heraldic traditions, the use of quartering and augmentations of honor is highly representative of Portuguese heraldry, but unlike in any other Iberian traditions, the use of heraldic crests is highly popular.
The rose is a common device in heraldry. It is often used both as a charge on a coat of arms and by itself as an heraldic badge. The heraldic rose has a stylized form consisting of five symmetrical lobes, five barbs, and a circular seed. The rose is one of the most common plant symbols in heraldry, together with the lily, which also has a stylistic representation in the fleur-de-lis.
In heraldry and heraldic vexillology, a blazon is a formal description of a coat of arms, flag or similar emblem, from which the reader can reconstruct the appropriate image. The verb to blazon means to create such a description. The visual depiction of a coat of arms or flag has traditionally had considerable latitude in design, but a verbal blazon specifies the essentially distinctive elements. A coat of arms or flag is therefore primarily defined not by a picture but rather by the wording of its blazon. Blazon is also the specialized language in which a blazon is written, and, as a verb, the act of writing such a description. Blazonry is the art, craft or practice of creating a blazon. The language employed in blazonry has its own vocabulary, grammar and syntax, which becomes essential for comprehension when blazoning a complex coat of arms.
The royal standards of England were narrow, tapering swallow-tailed heraldic flags, of considerable length, used mainly for mustering troops in battle, in pageants and at funerals, by the monarchs of England. In high favour during the Tudor period, the Royal English Standard was a flag that was of a separate design and purpose to the Royal Banner. It featured St George's Cross at its head, followed by a number of heraldic devices, a supporter, badges or crests, with a motto—but it did not bear a coat of arms. The Royal Standard changed its composition frequently from reign to reign, but retained the motto Dieu et mon droit, meaning God and my right; which was divided into two bands: Dieu et mon and Droyt.
Cornish heraldry is the form of coats of arms and other heraldic bearings and insignia used in Cornwall, United Kingdom. While similar to English, Scottish and Welsh heraldry, Cornish heraldry has its own distinctive features. Cornish heraldry typically makes use of the tinctures sable (black) and or (gold), and also uses certain creatures like Cornish choughs. It also uses the Cornish language extensively for mottoes and canting arms.
A number of cross symbols were developed for the purpose of the emerging system of heraldry, which appeared in Western Europe in about 1200. This tradition is partly in the use of the Christian cross an emblem from the 11th century, and increasingly during the age of the Crusades. Many cross variants were developed in the classical tradition of heraldry during the late medieval and early modern periods. Heraldic crosses are inherited in modern iconographic traditions and are used in numerous national flags.