This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+2610 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:
A ballot box is a temporarily sealed container, usually a square box though sometimes a tamper resistant bag, with a narrow slot in the top sufficient to accept a ballot paper in an election but which prevents anyone from accessing the votes cast until the close of the voting period. A ballot drop box allows voters who have received a ballot by mail to submit it for counting in a self-service fashion. In the United States, ballot boxes are usually sealed after the end of polling, and transported to vote-counting centers.
Representations
System
Representation (click value to copy)
Nº
9744
UTF-8
E2 98 90
UTF-16
26 10
UTF-32
00 00 26 10
URL-Quoted
%E2%98%90
HTML hex reference
☐
Wrong windows-1252 Mojibake
â˜
Encoding: GB18030 (hex bytes)
81 37 A4 30
AGL: Latin-5
uni2610
RFC 5137
\u'2610'
Bash and Zsh inside echo -e
\u2610
C and C++
\u2610
C#
\u2610
CSS
\002610
Excel
=UNICHAR(9744)
Go
\u2610
JavaScript
\u2610
Modern JavaScript since ES6
\u{2610}
JSON
\u2610
Java
\u2610
Lua
\u{2610}
Matlab
char(9744)
Perl
"\x{2610}"
PHP
\u{2610}
PostgreSQL
U&'\2610'
PowerShell
`u{2610}
Python
\u2610
Ruby
\u{2610}
Rust
\u{2610}
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