This character is a Other Symbol and is mainly used in the Katakana script.
The glyph is a square composition of the glyphs Katakana Letter Mi, Katakana Letter Ri. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. This katakana joins with other adjacent katakana to form a word. U+3349 offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3). Proposed in 1793, and adopted in 1795, the prefix comes from the Latin mille, meaning one thousand (the Latin plural is milia). Since 1960, the prefix is part of the International System of Units (SI).
Representations
System
Representation (click value to copy)
Nº
13129
UTF-8
E3 8D 89
UTF-16
33 49
UTF-32
00 00 33 49
URL-Quoted
%E3%8D%89
HTML hex reference
㍉
Wrong windows-1252 Mojibake
ã‰
Encoding: CP932 (hex bytes)
87 5F
Encoding: EUC_JIS_2004 (hex bytes)
AD C0
Encoding: EUC_JISX0213 (hex bytes)
AD C0
Encoding: GB18030 (hex bytes)
81 39 DD 37
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 2D 40 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 2D 40 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)
87 5F
Encoding: SHIFT_JISX0213 (hex bytes)
87 5F
Adobe Glyph List
mirisquare
RFC 5137
\u'3349'
Bash and Zsh inside echo -e
\u3349
C and C++
\u3349
C#
\u3349
CSS
\003349
Excel
=UNICHAR(13129)
Go
\u3349
JavaScript
\u3349
Modern JavaScript since ES6
\u{3349}
JSON
\u3349
Java
\u3349
Lua
\u{3349}
Matlab
char(13129)
Perl
"\x{3349}"
PHP
\u{3349}
PostgreSQL
U&'\3349'
PowerShell
`u{3349}
Python
\u3349
Ruby
\u{3349}
Rust
\u{3349}
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