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+25B1 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:
In Euclidean geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean parallel postulate and neither condition can be proven without appealing to the Euclidean parallel postulate or one of its equivalent formulations.
By comparison, a quadrilateral with at least one pair of parallel sides is a trapezoid in American English or a trapezium in British English.
The three-dimensional counterpart of a parallelogram is a parallelepiped.
The word comes from the Greek παραλληλό-γραμμον, parallēló-grammon, which means a shape "of parallel lines".
Representations
System
Representation (click value to copy)
Nº
9649
UTF-8
E2 96 B1
UTF-16
25 B1
UTF-32
00 00 25 B1
URL-Quoted
%E2%96%B1
HTML hex reference
▱
Wrong windows-1252 Mojibake
â–±
HTML named entity
▱
Encoding: EUC_JIS_2004 (hex bytes)
A6 ED
Encoding: EUC_JISX0213 (hex bytes)
A6 ED
Encoding: GB18030 (hex bytes)
81 37 9C 31
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 26 6D 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 26 6D 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)
83 EB
Encoding: SHIFT_JISX0213 (hex bytes)
83 EB
LATEX
\ElsevierGlyph{E381}
RFC 5137
\u'25B1'
Bash and Zsh inside echo -e
\u25B1
C and C++
\u25B1
C#
\u25B1
CSS
\0025B1
Excel
=UNICHAR(9649)
Go
\u25B1
JavaScript
\u25B1
Modern JavaScript since ES6
\u{25b1}
JSON
\u25B1
Java
\u25B1
Lua
\u{25B1}
Matlab
char(9649)
Perl
"\x{25B1}"
PHP
\u{25b1}
PostgreSQL
U&'\25B1'
PowerShell
`u{25B1}
Python
\u25B1
Ruby
\u{25b1}
Rust
\u{25b1}
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