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+0064Latin Small Letter D, Glyph for U+006DLatin Small Letter M. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+3377 offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
The decimetre (or decimeter in American English; symbol: dm), is a unit of length in the International System of Units, equal to one tenth of a metre, ten centimetres, one hundred millimetres, and 3.937 inches.
The common non-SI metric unit of volume, the litre, is defined as one cubic decimetre, although, from 1901 to 1964, there was a slight difference between the two due to the litre being defined using the kilogram rather than the metre.
Markings of a ship's draft are shown in decimeters in most of the world.
Representations
System
Representation (click value to copy)
Nº
13175
UTF-8
E3 8D B7
UTF-16
33 77
UTF-32
00 00 33 77
URL-Quoted
%E3%8D%B7
HTML hex reference
㍷
Wrong windows-1252 Mojibake
ã·
Encoding: GB18030 (hex bytes)
81 39 E2 33
RFC 5137
\u'3377'
Bash and Zsh inside echo -e
\u3377
C and C++
\u3377
C#
\u3377
CSS
\003377
Excel
=UNICHAR(13175)
Go
\u3377
JavaScript
\u3377
Modern JavaScript since ES6
\u{3377}
JSON
\u3377
Java
\u3377
Lua
\u{3377}
Matlab
char(13175)
Perl
"\x{3377}"
PHP
\u{3377}
PostgreSQL
U&'\3377'
PowerShell
`u{3377}
Python
\u3377
Ruby
\u{3377}
Rust
\u{3377}
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