This character is a Letter Number and is mainly used in the Runic script. The codepoint has the numeric value 18.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+16EF 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 Runic calendar (also Rune staff or Runic almanac) is a perpetual calendar, variants of which were used in Northern Europe until the 19th century. A typical runic calendar consisted of several horizontal lines of symbols, one above the other. Special days like solstices, equinoxes, and celebrations (including Christian holidays and feasts) were marked with additional lines of symbols.
Runic calendars were written on parchment or carved onto staves of wood, bone, or horn. The oldest one known, and the only one from the Middle Ages, is a staff from Nyköping, Sweden, believed to date from the 13th century. Most of the several thousand which survive are wooden calendars dating from the 16th and the 17th centuries. During the 18th century, Runic calendars had a renaissance as antiques, and runic calendars dating from around 1800 were made in the form of brass tobacco boxes.
Representations
System
Representation (click value to copy)
Nº
5871
UTF-8
E1 9B AF
UTF-16
16 EF
UTF-32
00 00 16 EF
URL-Quoted
%E1%9B%AF
HTML hex reference
ᛯ
Wrong windows-1252 Mojibake
ᛯ
Encoding: GB18030 (hex bytes)
81 34 B7 35
RFC 5137
\u'16EF'
Bash and Zsh inside echo -e
\u16EF
C and C++
\u16EF
C#
\u16EF
CSS
\0016EF
Excel
=UNICHAR(5871)
Go
\u16EF
JavaScript
\u16EF
Modern JavaScript since ES6
\u{16ef}
JSON
\u16EF
Java
\u16EF
Lua
\u{16EF}
Matlab
char(5871)
Perl
"\x{16EF}"
PHP
\u{16ef}
PostgreSQL
U&'\16EF'
PowerShell
`u{16EF}
Python
\u16EF
Ruby
\u{16ef}
Rust
\u{16ef}
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