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+2656 forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
The rook (; ♖, ♜) is a piece in the game of chess. It may move any number of squares horizontally or vertically without jumping, and it may capture an enemy piece on its path; it may participate in castling. Each player starts the game with two rooks, one in each corner on their side of the board.
Formerly, the rook (from Persian رخrokh/rukh, meaning "chariot") was alternatively called the tower, marquess, rector, and comes (count or earl). The term "castle" is considered to be informal or old-fashioned.
Representations
System
Representation (click value to copy)
Nº
9814
UTF-8
E2 99 96
UTF-16
26 56
UTF-32
00 00 26 56
URL-Quoted
%E2%99%96
HTML hex reference
♖
Wrong windows-1252 Mojibake
â™–
Encoding: GB18030 (hex bytes)
81 37 AA 38
RFC 5137
\u'2656'
Bash and Zsh inside echo -e
\u2656
C and C++
\u2656
C#
\u2656
CSS
\002656
Excel
=UNICHAR(9814)
Go
\u2656
JavaScript
\u2656
Modern JavaScript since ES6
\u{2656}
JSON
\u2656
Java
\u2656
Lua
\u{2656}
Matlab
char(9814)
Perl
"\x{2656}"
PHP
\u{2656}
PostgreSQL
U&'\2656'
PowerShell
`u{2656}
Python
\u2656
Ruby
\u{2656}
Rust
\u{2656}
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