The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+0271 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
The letter Ɱ (minuscule: ɱ), called M with hook, meng, or emg, is a letter based on the letter M. Its minuscule ɱ is used to transcribe a voiced labiodental nasal in the International Phonetic Alphabet.
In Americanist phonetic transcription, the lowercase ɱ is used for transcribing a voiced labiodental nasal stop and the uppercase Ɱ for a voiceless labiodental nasal stop.
The majuscule and the minuscule are located at U+2C6E and U+0271 in Unicode, respectively.
Representations
System
Representation (click value to copy)
Nº
625
UTF-8
C9 B1
UTF-16
02 71
UTF-32
00 00 02 71
URL-Quoted
%C9%B1
HTML hex reference
ɱ
Wrong windows-1252 Mojibake
ɱ
Encoding: EUC_JIS_2004 (hex bytes)
AA E5
Encoding: EUC_JISX0213 (hex bytes)
AA E5
Encoding: GB18030 (hex bytes)
81 30 AE 38
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 2A 65 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 2A 65 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)
85 E3
Encoding: SHIFT_JISX0213 (hex bytes)
85 E3
LATEX
\Elzltlmr
AGL: Latin-5
uni0271
Adobe Glyph List
mhook
RFC 5137
\u'0271'
Bash and Zsh inside echo -e
\u0271
C and C++
\u0271
C#
\u0271
CSS
\000271
Excel
=UNICHAR(625)
Go
\u0271
JavaScript
\u0271
Modern JavaScript since ES6
\u{271}
JSON
\u0271
Java
\u0271
Lua
\u{271}
Matlab
char(625)
Perl
"\x{271}"
PHP
\u{271}
PostgreSQL
U&'\0271'
PowerShell
`u{271}
Python
\u0271
Ruby
\u{271}
Rust
\u{271}
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