Home U+25A0 to U+25FF Geometric Shapes
Glyph for U+25DB
Source: Noto Sans Symbols2

U+25DB LOWER HALF INVERSE WHITE CIRCLE

U+25DB was added to Unicode in version 1.1 (1993). It belongs to the block U+25A0 to U+25FF Geometric Shapes in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Other Symbol and is commonly used, that is, in no specific script.

The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+25DB behaves as Alphabetic regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180° (equivalently, π radians, or a half-turn). It has only one line of symmetry (reflection symmetry). In non-technical usage, the term "semicircle" is sometimes used to refer to a half-disk, which is a two-dimensional geometric shape that also includes the diameter segment from one end of the arc to the other as well as all the interior points.

By Thales' theorem, any triangle inscribed in a semicircle with a vertex at each of the endpoints of the semicircle and the third vertex elsewhere on the semicircle is a right triangle, with right angle at the third vertex.

All lines intersecting the semicircle perpendicularly are concurrent at the center of the circle containing the given semicircle.

Representations

System Representation
9691
UTF-8 E2 97 9B
UTF-16 25 DB
UTF-32 00 00 25 DB
URL-Quoted %E2%97%9B
HTML-Escape ◛
Wrong windows-1252 Mojibake ◛

Elsewhere

Complete Record

Property Value
Age 1.1 (1993)
Unicode Name LOWER HALF INVERSE WHITE CIRCLE
Unicode 1 Name
Block Geometric Shapes
General Category Other Symbol
Script Common
Bidirectional Category Other Neutral
Combining Class Not Reordered
Decomposition Type None
Decomposition Mapping Glyph for U+25DB Lower Half Inverse White Circle
Lowercase
Simple Lowercase Mapping Glyph for U+25DB Lower Half Inverse White Circle
Lowercase Mapping Glyph for U+25DB Lower Half Inverse White Circle
Uppercase
Simple Uppercase Mapping Glyph for U+25DB Lower Half Inverse White Circle
Uppercase Mapping Glyph for U+25DB Lower Half Inverse White Circle
Simple Titlecase Mapping Glyph for U+25DB Lower Half Inverse White Circle
Titlecase Mapping Glyph for U+25DB Lower Half Inverse White Circle
Case Folding Glyph for U+25DB Lower Half Inverse White Circle
ASCII Hex Digit
Alphabetic
Bidi Control
Bidi Mirrored
Composition Exclusion
Case Ignorable
Changes When Casefolded
Changes When Casemapped
Changes When NFKC Casefolded
Changes When Lowercased
Changes When Titlecased
Changes When Uppercased
Cased
Full Composition Exclusion
Default Ignorable Code Point
Dash
Deprecated
Diacritic
Emoji Modifier Base
Emoji Component
Emoji Modifier
Emoji Presentation
Emoji
Extender
Extended Pictographic
FC NFKC Closure Glyph for U+25DB Lower Half Inverse White Circle
Grapheme Cluster Break Any
Grapheme Base
Grapheme Extend
Grapheme Link
Hex Digit
Hyphen
ID Continue
ID Start
IDS Binary Operator
IDS Trinary Operator and
Ideographic
Indic Mantra Category
Indic Positional Category NA
Indic Syllabic Category Other
Jamo Short Name
Join Control
Logical Order Exception
Math
Noncharacter Code Point
NFC Quick Check Yes
NFD Quick Check Yes
NFKC Casefold Glyph for U+25DB Lower Half Inverse White Circle
NFKC Quick Check Yes
NFKD Quick Check Yes
Other Alphabetic
Other Default Ignorable Code Point
Other Grapheme Extend
Other ID Continue
Other ID Start
Other Lowercase
Other Math
Other Uppercase
Prepended Concatenation Mark
Pattern Syntax
Pattern White Space
Quotation Mark
Regional Indicator
Radical
Sentence Break Other
Soft Dotted
Sentence Terminal
Terminal Punctuation
Unified Ideograph
Variation Selector
Word Break Other
White Space
XID Continue
XID Start
Expands On NFC
Expands On NFD
Expands On NFKC
Expands On NFKD
Bidi Paired Bracket Glyph for U+25DB Lower Half Inverse White Circle
Bidi Paired Bracket Type None
East Asian Width Neutral
Hangul Syllable Type Not Applicable
ISO 10646 Comment
Joining Group No_Joining_Group
Joining Type Non Joining
Line Break Alphabetic
Numeric Type None
Numeric Value not a number
Simple Case Folding Glyph for U+25DB Lower Half Inverse White Circle
Script Extension
Vertical Orientation U