This character is a Otro símbolo and is commonly used, that is, in no specific script.
The glyph is a square composition of the glyphs Latin Small Letter F, Latin Small Letter M. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+3399 offers a line break opportunity at its position, except in some numeric contexts.
El Wikipedia tiene la siguiente información acerca de este punto de código:
The femtometre (American spelling femtometer), symbol fm, (derived from the Danish and Norwegian word femten 'fifteen', Ancient Greek: μέτρον, romanized: metrοn, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means a quadrillionth of one metre. This distance is sometimes called a fermi and was so named in honour of Italian naturalized to American physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
Representaciones
Sistema
Representación (click value to copy)
N.º
13209
UTF-8
E3 8E 99
UTF-16
33 99
UTF-32
00 00 33 99
URL-Quoted
%E3%8E%99
HTML hex reference
㎙
Mojibake mal de windows-1252
㎙
Codificación: CP949 (hexadecimales bytes)
A7 AB
Codificación: EUC_KR (hexadecimales bytes)
A7 AB
Codificación: GB18030 (hexadecimales bytes)
81 39 E5 35
Codificación: ISO2022_JP_2 (hexadecimales bytes)
1B 24 28 43 27 2B 1B 28 42
Codificación: ISO2022_KR (hexadecimales bytes)
1B 24 29 43 0E 27 2B 0F
Codificación: JOHAB (hexadecimales bytes)
DC 3B
Adobe Glyph List
fmsquare
RFC 5137
\u'3399'
Bash and Zsh inside echo -e
\u3399
C and C++
\u3399
C#
\u3399
CSS
\003399
Excel
=UNICHAR(13209)
Go
\u3399
JavaScript
\u3399
Modern JavaScript since ES6
\u{3399}
JSON
\u3399
Java
\u3399
Lua
\u{3399}
Matlab
char(13209)
Perl
"\x{3399}"
PHP
\u{3399}
PostgreSQL
U&'\3399'
PowerShell
`u{3399}
Python
\u3399
Ruby
\u{3399}
Rust
\u{3399}
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