This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+4DDF forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
This is a list of the 64 hexagrams of the I Ching, or Book of Changes, and their Unicode character codes.
This list is in King Wen order. (Cf. other hexagram sequences.)
Representations
System
Representation (click value to copy)
Nº
19935
UTF-8
E4 B7 9F
UTF-16
4D DF
UTF-32
00 00 4D DF
URL-Quoted
%E4%B7%9F
HTML hex reference
䷟
Wrong windows-1252 Mojibake
ä·Ÿ
Encoding: GB18030 (hex bytes)
82 35 8C 30
RFC 5137
\u'4DDF'
Bash and Zsh inside echo -e
\u4DDF
C and C++
\u4DDF
C#
\u4DDF
CSS
\004DDF
Excel
=UNICHAR(19935)
Go
\u4DDF
JavaScript
\u4DDF
Modern JavaScript since ES6
\u{4ddf}
JSON
\u4DDF
Java
\u4DDF
Lua
\u{4DDF}
Matlab
char(19935)
Perl
"\x{4DDF}"
PHP
\u{4ddf}
PostgreSQL
U&'\4DDF'
PowerShell
`u{4DDF}
Python
\u4DDF
Ruby
\u{4ddf}
Rust
\u{4ddf}
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