This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is a square composition of the glyphs Glyph for U+006BLatin Small Letter K, Glyph for U+0074Latin Small Letter T. Its East Asian Width is wide. In bidirectional text it is written from left to right. When changing direction it is not mirrored. U+33CF offers a line break opportunity at its position, except in some numeric contexts.
The Wikipedia has the following information about this codepoint:
The knot () is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s). The ISO standard symbol for the knot is kn. The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE), while kt is also common, especially in aviation, where it is the form recommended by the International Civil Aviation Organization (ICAO). The knot is a non-SI unit. The knot is used in meteorology, and in maritime and air navigation. A vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour.
Representations
System
Representation (click value to copy)
Nº
13263
UTF-8
E3 8F 8F
UTF-16
33 CF
UTF-32
00 00 33 CF
URL-Quoted
%E3%8F%8F
HTML hex reference
㏏
Wrong windows-1252 Mojibake
ã
Encoding: CP949 (hex bytes)
A7 B9
Encoding: EUC_KR (hex bytes)
A7 B9
Encoding: GB18030 (hex bytes)
81 39 EA 33
Encoding: ISO2022_JP_2 (hex bytes)
1B 24 28 43 27 39 1B 28 42
Encoding: ISO2022_KR (hex bytes)
1B 24 29 43 0E 27 39 0F
Encoding: JOHAB (hex bytes)
DC 49
Adobe Glyph List
ktsquare
RFC 5137
\u'33CF'
Bash and Zsh inside echo -e
\u33CF
C and C++
\u33CF
C#
\u33CF
CSS
\0033CF
Excel
=UNICHAR(13263)
Go
\u33CF
JavaScript
\u33CF
Modern JavaScript since ES6
\u{33cf}
JSON
\u33CF
Java
\u33CF
Lua
\u{33CF}
Matlab
char(13263)
Perl
"\x{33CF}"
PHP
\u{33cf}
PostgreSQL
U&'\33CF'
PowerShell
`u{33CF}
Python
\u33CF
Ruby
\u{33cf}
Rust
\u{33cf}
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