This character is a Other Punctuation and is commonly used, that is, in no specific script.
The glyph is a small version of the glyph Question Mark. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. It can end sentences at appropriate places. U+FE56 prohibits a line break before it.
The Wikipedia has the following information about this codepoint:
The question mark? (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates a question or interrogative clause or phrase in many languages.
Representations
System
Representation (click value to copy)
Nº
65110
UTF-8
EF B9 96
UTF-16
FE 56
UTF-32
00 00 FE 56
URL-Quoted
%EF%B9%96
HTML hex reference
﹖
Wrong windows-1252 Mojibake
ï¹–
Encoding: BIG5 (hex bytes)
A1 53
Encoding: BIG5HKSCS (hex bytes)
A1 53
Encoding: CP950 (hex bytes)
A1 53
Encoding: GBK (hex bytes)
A9 74
Encoding: GB18030 (hex bytes)
A9 74
RFC 5137
\u'FE56'
Bash and Zsh inside echo -e
\uFE56
C and C++
\uFE56
C#
\uFE56
CSS
\00FE56
Excel
=UNICHAR(65110)
Go
\uFE56
JavaScript
\uFE56
Modern JavaScript since ES6
\u{fe56}
JSON
\uFE56
Java
\uFE56
Lua
\u{FE56}
Matlab
char(65110)
Perl
"\x{FE56}"
PHP
\u{fe56}
PostgreSQL
U&'\FE56'
PowerShell
`u{FE56}
Python
\uFE56
Ruby
\u{fe56}
Rust
\u{fe56}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)