Letterlike Symbols is a Unicode block containing 80 characters which are constructed mainly from the glyphs of one or more letters. In addition to this block, Unicode includes full styled mathematical alphabets, although Unicode does not explicitly categorize these characters as being "letterlike."
The Letterlike Symbols block contains two emoji: U+2122 and U+2139.[6][7]
The block has four standardized variants defined to specify emoji-style (U+FE0F VS16) or text presentation (U+FE0E VS15) for the two emoji, both of which default to a text presentation.[8]
Emoji variation sequences
U+
2122
2139
basecodepoint
™
ℹ
base+VS15 (text)
™︎
ℹ︎
base+VS16 (emoji)
™️
ℹ️
History
The following Unicode-related documents record the purpose and process of defining specific characters in the Letterlike Symbols block:
Aliprand, Joan (1999-02-05), "Script capital P", Approved Minutes -- UTC #78 & NCITS Subgroup L2 # 175 Joint Meeting, San Jose, CA -- December 1-4, 1998
Moore, Lisa (2005-08-26), "Consensus 103-C7", UTC #103 Minutes, Create a "Normative Name Alias" property and file in the UCD. Populate the property with names from the sections "Typos" and "Bad or misleading names" from document L2/05-137.
"M57.06", Unconfirmed minutes of WG2 meeting 57, 2011-03-31, WG2 accepts to add the formal name alias "WEIERSTRASS ELLIPTIC FUNCTION" to 2118 SCRIPT CAPITAL P.
Anderson, Deborah; Whistler, Ken; Pournader, Roozbeh; Moore, Lisa; Liang, Hai (2021-01-14), "25 Math Calligraphic Alphabets", Recommendations to UTC #166 January 2021 on Script Proposals
Moore, Lisa (2021-01-27), "Consensus 166-C33", UTC #166 Minutes, The UTC accepts 52 variation sequences to distinguish roundhand and chancery style mathematical script alphabetic characters
3.0
U+2139
1
N1138
LaBonté, Alain (1995-01-30), Proposal to add new characters (Keyboard related) to 10646
Aliprand, Joan (1998-07-31), "Signature Marks (IV.C.7)", Unconfirmed Minutes – UTC #77 & NCITS Subgroup L2 # 174 JOINT MEETING, Redmond, WA -- July 29-31, 1998
Moore, Lisa (2001-05-21), "Motion 86-M32", Minutes UTC #86 in Mountain View, Jan 2001, Change the name of the proposed character at U+2140 from DOUBLE STRUCK CAPITAL SIGMA to DOUBLE STRUCK N-ARY SUMMATION.
"3", Amendment of the part concerning the Korean characters in ISO/IEC 10646-1:1998 amendment 5 (Cover page and outline of proposal L2/99-380), 1999-12-07
Whistler, Ken (1999-12-09), "2.3", Comments to accompany a U.S. NO vote on JTC1 N5999, SC2 N3393, New Work item proposal (NP) for an amendment of the Korean part of ISO/IEC 10646-1:1993
"3", The technical justification of the proposal to amend the Korean character part of ISO/IEC 10646-1 (proposed addition of 79 symbolic characters), 2000-02-10
Mathematical Alphanumeric Symbols is a Unicode block comprising styled forms of Latin and Greek letters and decimal digits that enable mathematicians to denote different notions with different letter styles. The letters in various fonts often have specific, fixed meanings in particular areas of mathematics. By providing uniformity over numerous mathematical articles and books, these conventions help to read mathematical formulas. These also may be used to differentiate between concepts that share a letter in a single problem.
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