This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is a square composition of the glyphs Glyph for U+0049Latin Capital Letter I, Glyph for U+0055Latin Capital Letter U. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+337A offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances. International units are used to quantify vitamins and biologics (hormones, some medications, vaccines, blood products and similar biologically active substances).
International units as used in pharmacology are not part of the International System of Units (SI).
Representations
System
Representation (click value to copy)
Nº
13178
UTF-8
E3 8D BA
UTF-16
33 7A
UTF-32
00 00 33 7A
URL-Quoted
%E3%8D%BA
HTML hex reference
㍺
Wrong windows-1252 Mojibake
ãº
Encoding: GB18030 (hex bytes)
81 39 E2 36
RFC 5137
\u'337A'
Bash and Zsh inside echo -e
\u337A
C and C++
\u337A
C#
\u337A
CSS
\00337A
Excel
=UNICHAR(13178)
Go
\u337A
JavaScript
\u337A
Modern JavaScript since ES6
\u{337a}
JSON
\u337A
Java
\u337A
Lua
\u{337A}
Matlab
char(13178)
Perl
"\x{337A}"
PHP
\u{337a}
PostgreSQL
U&'\337A'
PowerShell
`u{337A}
Python
\u337A
Ruby
\u{337a}
Rust
\u{337a}
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