The glyph is not a composition. Its East Asian Width is narrow. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+0055 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with 30 other glyphs.
The Wikipedia has the following information about this codepoint:
U, or u, is the twenty-first letter and the fifth vowel letter of the Latin alphabet, used in the modern English alphabet and the alphabets of other western European languages and others worldwide. Its name in English is u (pronounced ), plural ues.
Representations
System
Representation (click value to copy)
Nº
85
UTF-8
55
UTF-16
00 55
UTF-32
00 00 00 55
URL-Quoted
%55
HTML hex reference
U
Encoding: ASCII (hex bytes)
55
Encoding: BIG5 (hex bytes)
55
Encoding: BIG5HKSCS (hex bytes)
55
Encoding: CP037 (hex bytes)
E4
Encoding: CP273 (hex bytes)
E4
Encoding: CP424 (hex bytes)
E4
Encoding: CP437 (hex bytes)
55
Encoding: CP500 (hex bytes)
E4
Encoding: CP720 (hex bytes)
55
Encoding: CP737 (hex bytes)
55
Encoding: CP775 (hex bytes)
55
Encoding: CP850 (hex bytes)
55
Encoding: CP852 (hex bytes)
55
Encoding: CP855 (hex bytes)
55
Encoding: CP856 (hex bytes)
55
Encoding: CP857 (hex bytes)
55
Encoding: CP858 (hex bytes)
55
Encoding: CP860 (hex bytes)
55
Encoding: CP861 (hex bytes)
55
Encoding: CP862 (hex bytes)
55
Encoding: CP863 (hex bytes)
55
Encoding: CP864 (hex bytes)
55
Encoding: CP865 (hex bytes)
55
Encoding: CP866 (hex bytes)
55
Encoding: CP869 (hex bytes)
55
Encoding: CP874 (hex bytes)
55
Encoding: CP875 (hex bytes)
E4
Encoding: CP932 (hex bytes)
55
Encoding: CP949 (hex bytes)
55
Encoding: CP950 (hex bytes)
55
Encoding: CP1006 (hex bytes)
55
Encoding: CP1026 (hex bytes)
E4
Encoding: CP1125 (hex bytes)
55
Encoding: CP1140 (hex bytes)
E4
Encoding: CP1250 (hex bytes)
55
Encoding: CP1251 (hex bytes)
55
Encoding: CP1252 (hex bytes)
55
Encoding: CP1253 (hex bytes)
55
Encoding: CP1254 (hex bytes)
55
Encoding: CP1255 (hex bytes)
55
Encoding: CP1256 (hex bytes)
55
Encoding: CP1257 (hex bytes)
55
Encoding: CP1258 (hex bytes)
55
Encoding: EUC_JP (hex bytes)
55
Encoding: EUC_JIS_2004 (hex bytes)
55
Encoding: EUC_JISX0213 (hex bytes)
55
Encoding: EUC_KR (hex bytes)
55
Encoding: GB2312 (hex bytes)
55
Encoding: GBK (hex bytes)
55
Encoding: GB18030 (hex bytes)
55
Encoding: HZ (hex bytes)
55
Encoding: ISO2022_JP (hex bytes)
55
Encoding: ISO2022_JP_1 (hex bytes)
55
Encoding: ISO2022_JP_2 (hex bytes)
55
Encoding: ISO2022_JP_2004 (hex bytes)
55
Encoding: ISO2022_JP_3 (hex bytes)
55
Encoding: ISO2022_JP_EXT (hex bytes)
55
Encoding: ISO2022_KR (hex bytes)
55
Encoding: LATIN_1 (hex bytes)
55
Encoding: ISO8859_2 (hex bytes)
55
Encoding: ISO8859_3 (hex bytes)
55
Encoding: ISO8859_4 (hex bytes)
55
Encoding: ISO8859_5 (hex bytes)
55
Encoding: ISO8859_6 (hex bytes)
55
Encoding: ISO8859_7 (hex bytes)
55
Encoding: ISO8859_8 (hex bytes)
55
Encoding: ISO8859_9 (hex bytes)
55
Encoding: ISO8859_10 (hex bytes)
55
Encoding: ISO8859_11 (hex bytes)
55
Encoding: ISO8859_13 (hex bytes)
55
Encoding: ISO8859_14 (hex bytes)
55
Encoding: ISO8859_15 (hex bytes)
55
Encoding: ISO8859_16 (hex bytes)
55
Encoding: JOHAB (hex bytes)
55
Encoding: KOI8_R (hex bytes)
55
Encoding: KOI8_T (hex bytes)
55
Encoding: KOI8_U (hex bytes)
55
Encoding: KZ1048 (hex bytes)
55
Encoding: MAC_CYRILLIC (hex bytes)
55
Encoding: MAC_GREEK (hex bytes)
55
Encoding: MAC_ICELAND (hex bytes)
55
Encoding: MAC_LATIN2 (hex bytes)
55
Encoding: MAC_ROMAN (hex bytes)
55
Encoding: MAC_TURKISH (hex bytes)
55
Encoding: PTCP154 (hex bytes)
55
Encoding: SHIFT_JIS (hex bytes)
55
Encoding: SHIFT_JIS_2004 (hex bytes)
55
Encoding: SHIFT_JISX0213 (hex bytes)
55
Encoding: CP037 (hex bytes)
E4
Encoding: CP1025 (hex bytes)
E4
Encoding: CP1047 (hex bytes)
E4
Encoding: CP1097 (hex bytes)
E4
Encoding: CP1112 (hex bytes)
E4
Encoding: CP1122 (hex bytes)
E4
Encoding: CP1123 (hex bytes)
E4
Encoding: CP1140 (hex bytes)
E4
Encoding: CP1141 (hex bytes)
E4
Encoding: CP1142 (hex bytes)
E4
Encoding: CP1143 (hex bytes)
E4
Encoding: CP1144 (hex bytes)
E4
Encoding: CP1145 (hex bytes)
E4
Encoding: CP1146 (hex bytes)
E4
Encoding: CP1147 (hex bytes)
E4
Encoding: CP1148 (hex bytes)
E4
Encoding: CP1148MS (hex bytes)
E4
Encoding: CP1149 (hex bytes)
E4
Encoding: CP273 (hex bytes)
E4
Encoding: CP277 (hex bytes)
E4
Encoding: CP278 (hex bytes)
E4
Encoding: CP280 (hex bytes)
E4
Encoding: CP284 (hex bytes)
E4
Encoding: CP285 (hex bytes)
E4
Encoding: CP290 (hex bytes)
E4
Encoding: CP297 (hex bytes)
E4
Encoding: CP420 (hex bytes)
E4
Encoding: CP424 (hex bytes)
E4
Encoding: CP500 (hex bytes)
E4
Encoding: CP500MS (hex bytes)
E4
Encoding: CP833 (hex bytes)
E4
Encoding: CP838 (hex bytes)
E4
Encoding: CP870 (hex bytes)
E4
Encoding: CP871 (hex bytes)
E4
Encoding: CP875 (hex bytes)
E4
AGL: Latin-1
U
AGL: Latin-2
U
AGL: Latin-3
U
AGL: Latin-4
U
AGL: Latin-5
U
Adobe Glyph List
U
digraph
U
RFC 5137
\u'0055'
Bash and Zsh inside echo -e
\u0055
C and C++
\u0055
C#
\u0055
CSS
\000055
Excel
=UNICHAR(85)
Go
\u0055
JavaScript
\u0055
Modern JavaScript since ES6
\u{55}
JSON
\u0055
Java
\u0055
Lua
\u{55}
Matlab
char(85)
Perl
"\x{55}"
PHP
\u{55}
PostgreSQL
U&'\0055'
PowerShell
`u{55}
Python
\u0055
Ruby
\u{55}
Rust
\u{55}
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