The glyph is not a composition. Its East Asian Width is narrow. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+004D forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 34 other glyphs.
The Wikipedia has the following information about this codepoint:
M, or m, is the thirteenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of several western European languages and others worldwide. Its name in English is em (pronounced ), plural ems.
Representations
System
Representation (click value to copy)
Nº
77
UTF-8
4D
UTF-16
00 4D
UTF-32
00 00 00 4D
URL-Quoted
%4D
HTML hex reference
M
Encoding: ASCII (hex bytes)
4D
Encoding: BIG5 (hex bytes)
4D
Encoding: BIG5HKSCS (hex bytes)
4D
Encoding: CP037 (hex bytes)
D4
Encoding: CP273 (hex bytes)
D4
Encoding: CP424 (hex bytes)
D4
Encoding: CP437 (hex bytes)
4D
Encoding: CP500 (hex bytes)
D4
Encoding: CP720 (hex bytes)
4D
Encoding: CP737 (hex bytes)
4D
Encoding: CP775 (hex bytes)
4D
Encoding: CP850 (hex bytes)
4D
Encoding: CP852 (hex bytes)
4D
Encoding: CP855 (hex bytes)
4D
Encoding: CP856 (hex bytes)
4D
Encoding: CP857 (hex bytes)
4D
Encoding: CP858 (hex bytes)
4D
Encoding: CP860 (hex bytes)
4D
Encoding: CP861 (hex bytes)
4D
Encoding: CP862 (hex bytes)
4D
Encoding: CP863 (hex bytes)
4D
Encoding: CP864 (hex bytes)
4D
Encoding: CP865 (hex bytes)
4D
Encoding: CP866 (hex bytes)
4D
Encoding: CP869 (hex bytes)
4D
Encoding: CP874 (hex bytes)
4D
Encoding: CP875 (hex bytes)
D4
Encoding: CP932 (hex bytes)
4D
Encoding: CP949 (hex bytes)
4D
Encoding: CP950 (hex bytes)
4D
Encoding: CP1006 (hex bytes)
4D
Encoding: CP1026 (hex bytes)
D4
Encoding: CP1125 (hex bytes)
4D
Encoding: CP1140 (hex bytes)
D4
Encoding: CP1250 (hex bytes)
4D
Encoding: CP1251 (hex bytes)
4D
Encoding: CP1252 (hex bytes)
4D
Encoding: CP1253 (hex bytes)
4D
Encoding: CP1254 (hex bytes)
4D
Encoding: CP1255 (hex bytes)
4D
Encoding: CP1256 (hex bytes)
4D
Encoding: CP1257 (hex bytes)
4D
Encoding: CP1258 (hex bytes)
4D
Encoding: EUC_JP (hex bytes)
4D
Encoding: EUC_JIS_2004 (hex bytes)
4D
Encoding: EUC_JISX0213 (hex bytes)
4D
Encoding: EUC_KR (hex bytes)
4D
Encoding: GB2312 (hex bytes)
4D
Encoding: GBK (hex bytes)
4D
Encoding: GB18030 (hex bytes)
4D
Encoding: HZ (hex bytes)
4D
Encoding: ISO2022_JP (hex bytes)
4D
Encoding: ISO2022_JP_1 (hex bytes)
4D
Encoding: ISO2022_JP_2 (hex bytes)
4D
Encoding: ISO2022_JP_2004 (hex bytes)
4D
Encoding: ISO2022_JP_3 (hex bytes)
4D
Encoding: ISO2022_JP_EXT (hex bytes)
4D
Encoding: ISO2022_KR (hex bytes)
4D
Encoding: LATIN_1 (hex bytes)
4D
Encoding: ISO8859_2 (hex bytes)
4D
Encoding: ISO8859_3 (hex bytes)
4D
Encoding: ISO8859_4 (hex bytes)
4D
Encoding: ISO8859_5 (hex bytes)
4D
Encoding: ISO8859_6 (hex bytes)
4D
Encoding: ISO8859_7 (hex bytes)
4D
Encoding: ISO8859_8 (hex bytes)
4D
Encoding: ISO8859_9 (hex bytes)
4D
Encoding: ISO8859_10 (hex bytes)
4D
Encoding: ISO8859_11 (hex bytes)
4D
Encoding: ISO8859_13 (hex bytes)
4D
Encoding: ISO8859_14 (hex bytes)
4D
Encoding: ISO8859_15 (hex bytes)
4D
Encoding: ISO8859_16 (hex bytes)
4D
Encoding: JOHAB (hex bytes)
4D
Encoding: KOI8_R (hex bytes)
4D
Encoding: KOI8_T (hex bytes)
4D
Encoding: KOI8_U (hex bytes)
4D
Encoding: KZ1048 (hex bytes)
4D
Encoding: MAC_CYRILLIC (hex bytes)
4D
Encoding: MAC_GREEK (hex bytes)
4D
Encoding: MAC_ICELAND (hex bytes)
4D
Encoding: MAC_LATIN2 (hex bytes)
4D
Encoding: MAC_ROMAN (hex bytes)
4D
Encoding: MAC_TURKISH (hex bytes)
4D
Encoding: PTCP154 (hex bytes)
4D
Encoding: SHIFT_JIS (hex bytes)
4D
Encoding: SHIFT_JIS_2004 (hex bytes)
4D
Encoding: SHIFT_JISX0213 (hex bytes)
4D
Encoding: CP037 (hex bytes)
D4
Encoding: CP1025 (hex bytes)
D4
Encoding: CP1047 (hex bytes)
D4
Encoding: CP1097 (hex bytes)
D4
Encoding: CP1112 (hex bytes)
D4
Encoding: CP1122 (hex bytes)
D4
Encoding: CP1123 (hex bytes)
D4
Encoding: CP1140 (hex bytes)
D4
Encoding: CP1141 (hex bytes)
D4
Encoding: CP1142 (hex bytes)
D4
Encoding: CP1143 (hex bytes)
D4
Encoding: CP1144 (hex bytes)
D4
Encoding: CP1145 (hex bytes)
D4
Encoding: CP1146 (hex bytes)
D4
Encoding: CP1147 (hex bytes)
D4
Encoding: CP1148 (hex bytes)
D4
Encoding: CP1148MS (hex bytes)
D4
Encoding: CP1149 (hex bytes)
D4
Encoding: CP273 (hex bytes)
D4
Encoding: CP277 (hex bytes)
D4
Encoding: CP278 (hex bytes)
D4
Encoding: CP280 (hex bytes)
D4
Encoding: CP284 (hex bytes)
D4
Encoding: CP285 (hex bytes)
D4
Encoding: CP290 (hex bytes)
D4
Encoding: CP297 (hex bytes)
D4
Encoding: CP420 (hex bytes)
D4
Encoding: CP424 (hex bytes)
D4
Encoding: CP500 (hex bytes)
D4
Encoding: CP500MS (hex bytes)
D4
Encoding: CP833 (hex bytes)
D4
Encoding: CP838 (hex bytes)
D4
Encoding: CP870 (hex bytes)
D4
Encoding: CP871 (hex bytes)
D4
Encoding: CP875 (hex bytes)
D4
AGL: Latin-1
M
AGL: Latin-2
M
AGL: Latin-3
M
AGL: Latin-4
M
AGL: Latin-5
M
Adobe Glyph List
M
digraph
M
RFC 5137
\u'004D'
Bash and Zsh inside echo -e
\u004D
C and C++
\u004D
C#
\u004D
CSS
\00004D
Excel
=UNICHAR(77)
Go
\u004D
JavaScript
\u004D
Modern JavaScript since ES6
\u{4d}
JSON
\u004D
Java
\u004D
Lua
\u{4D}
Matlab
char(77)
Perl
"\x{4D}"
PHP
\u{4d}
PostgreSQL
U&'\004D'
PowerShell
`u{4D}
Python
\u004D
Ruby
\u{4d}
Rust
\u{4d}
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