This character is a Nonspacing Mark and inherits its script property from the preceding character. It is also used in the scripts Cyrillic, Greek, Latin, Old Permic. The character is also known as short and Greek vrachy.
The glyph is not a composition. Its width in East Asian texts is determined by its context. It can be displayed wide or narrow. In bidirectional text it acts as Nonspacing Mark. When changing direction it is not mirrored. U+0306 prohibits a line break before it. The glyph can be confused with 28 other glyphs.
The Wikipedia has the following information about this codepoint:
A breve (BREEV, less often BREV, neuter form of the Latin brevis "short, brief") is the diacritic mark ◌̆, shaped like the bottom half of a circle. As used in Ancient Greek, it is also called brachy, βραχύ. It resembles the caron (◌̌, the wedge or háček in Czech, mäkčeň in Slovak) but is rounded, in contrast to the angular tip of the caron. In many forms of Latin, ◌̆ is used for a shorter, softer variant of a vowel, such as "Ĭ", where the sound is nearly identical to the English /i/. (See: Latin IPA)
Representations
System
Representation (click value to copy)
Nº
774
UTF-8
CC 86
UTF-16
03 06
UTF-32
00 00 03 06
URL-Quoted
%CC%86
HTML hex reference
̆
Wrong windows-1252 Mojibake
◌̆
alias
short
alias
Greek vrachy
Encoding: EUC_JIS_2004 (hex bytes)
AB D7
Encoding: EUC_JISX0213 (hex bytes)
AB D7
Encoding: GB18030 (hex bytes)
81 30 BD 32
Encoding: ISO2022_JP_2004 (hex bytes)
1B 24 28 51 2B 57 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)
1B 24 28 4F 2B 57 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)
86 76
Encoding: SHIFT_JISX0213 (hex bytes)
86 76
LATEX
\u
AGL: Latin-4
uni0306
AGL: Latin-5
uni0306
Adobe Glyph List
brevecmb
RFC 5137
\u'0306'
Bash and Zsh inside echo -e
\u0306
C and C++
\u0306
C#
\u0306
CSS
\000306
Excel
=UNICHAR(774)
Go
\u0306
JavaScript
\u0306
Modern JavaScript since ES6
\u{306}
JSON
\u0306
Java
\u0306
Lua
\u{306}
Matlab
char(774)
Perl
"\x{306}"
PHP
\u{306}
PostgreSQL
U&'\0306'
PowerShell
`u{306}
Python
\u0306
Ruby
\u{306}
Rust
\u{306}
Click the star button next to each label to set this representation as favorite or remove it from the favorites. Favorites will be shown initially. (Favorites are stored locally on your computer and never sent over the internet.)