This character is a Unassigned and has no script assigned.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Boundary Neutral. When changing direction it is not mirrored. U+FFFE does not participate in line break calculations.
This is a so-called “noncharacter”, one of 66 in Unicode. These codepoints are
reserved solely for internal use. For further information, see Unicode’s FAQ
on noncharacters.
Representations
System
Representation (click value to copy)
Nº
65534
UTF-8
EF BF BE
UTF-16
FF FE
UTF-32
00 00 FF FE
URL-Quoted
%EF%BF%BE
HTML hex reference

Wrong windows-1252 Mojibake
�
Encoding: GB18030 (hex bytes)
84 31 A4 38
RFC 5137
\u'FFFE'
Bash and Zsh inside echo -e
\uFFFE
C and C++
\uFFFE
C#
\uFFFE
CSS
\00FFFE
Excel
=UNICHAR(65534)
Go
\uFFFE
JavaScript
\uFFFE
Modern JavaScript since ES6
\u{fffe}
JSON
\uFFFE
Java
\uFFFE
Lua
\u{FFFE}
Matlab
char(65534)
Perl
"\x{FFFE}"
PHP
\u{fffe}
PostgreSQL
U&'\FFFE'
PowerShell
`u{FFFE}
Python
\uFFFE
Ruby
\u{fffe}
Rust
\u{fffe}
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