This character is a Other Letter and is mainly used in the Old Persian script.
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+103CF forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
Old Persian cuneiform is a semi-alphabetic cuneiform script that was the primary script for Old Persian. Texts written in this cuneiform have been found in Iran (Persepolis, Susa, Hamadan, Kharg Island), Armenia, Romania (Gherla), Turkey (Van Fortress), and along the Suez Canal. They were mostly inscriptions from the time period of Darius I, such as the DNa inscription, as well as his son, Xerxes I. Later kings down to Artaxerxes III used more recent forms of the language classified as "pre-Middle Persian".
Representations
System
Representation (click value to copy)
NΒΊ
66511
UTF-8
F0 90 8F 8F
UTF-16
D8 00 DF CF
UTF-32
00 01 03 CF
URL-Quoted
%F0%90%8F%8F
HTML hex reference
𐏏
Wrong windows-1252 Mojibake
Γ°ΒΒΒ
Encoding: GB18030 (hex bytes)
90 30 E2 35
RFC 5137
\u'103CF'
Bash and Zsh inside echo -e
\U000103CF
C and C++
\U000103CF
C#
\U000103CF
CSS
\0103CF
Excel
=UNICHAR(66511)
Go
\U000103CF
JavaScript
\uD800\uDFCF
Modern JavaScript since ES6
\u{103cf}
JSON
\uD800\uDFCF
Java
\uD800\uDFCF
Lua
\u{103CF}
Matlab
char(66511)
Perl
"\x{103CF}"
PHP
\u{103cf}
PostgreSQL
U&'\+0103CF'
PowerShell
`u{103CF}
Python
\U000103CF
Ruby
\u{103cf}
Rust
\u{103cf}
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