Inicio: go to the homepage U+2200 para U+22FF Mathematical Operators
Glifo para U+2218
Fuente: Noto Sans Symbols2

U+2218 Ring Operator

U+2218 was added in Unicode version 1.1 in 1993. It belongs to the block U+2200 para U+22FF Mathematical Operators in the U+0000 para U+FFFF Basic Multilingual Plane.

This character is a Puntuación matemática and is commonly used, that is, in no specific script. El carácter es también conocido como composite function y APL jot.

The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+2218 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.

The CLDR project calls this character “operador de anillo” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: grado, o volada.

El Wikipedia tiene la siguiente información acerca de este punto de código:

In mathematics, function composition is an operation  ∘  that takes two functions f and g, and produces a function h = g  ∘  f such that h(x) = g(f(x)). In this operation, the function g is applied to the result of applying the function f to x. That is, the functions f : XY and g : YZ are composed to yield a function that maps x in domain X to g(f(x)) in codomain Z. Intuitively, if z is a function of y, and y is a function of x, then z is a function of x. The resulting composite function is denoted g ∘ f : XZ, defined by (g ∘ f )(x) = g(f(x)) for all x in X.

The notation g ∘ f is read as "g of f ", "g after f ", "g circle f ", "g round f ", "g about f ", "g composed with f ", "g following f ", "f then g", or "g on f ", or "the composition of g and f ". Intuitively, composing functions is a chaining process in which the output of function f feeds the input of function g.

The composition of functions is a special case of the composition of relations, sometimes also denoted by . As a result, all properties of composition of relations are true of composition of functions, such as the property of associativity.

Composition of functions is different from multiplication of functions (if defined at all), and has some quite different properties; in particular, composition of functions is not commutative.

Representaciones

Sistema Representación
N.º 8728
UTF-8 E2 88 98
UTF-16 22 18
UTF-32 00 00 22 18
URL-Quoted %E2%88%98
HTML hex reference ∘
Mojibake mal de windows-1252 ∘
HTML named entity ∘
HTML named entity ∘
alias composite function
alias APL jot
LATEX \circ
dígrafo Ob

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Registro completo

Propiedad Valor
Antigüedad (age) 1.1 (1993)
Nombre Unicode (na) RING OPERATOR
Nombre Unicode 1 (na1)
Block (blk) Mathematical Operators
Categoría general (gc) Puntuación matemática
Script (sc) Common
Categoría de bidireccionalidad (bc) Other Neutral
Combining Class (ccc) Not Reordered
Tipo de descomposición (dt) none
Decomposition Mapping (dm) Glifo para U+2218 Ring Operator
Minúscula (Lower)
Simple Lowercase Mapping (slc) Glifo para U+2218 Ring Operator
Lowercase Mapping (lc) Glifo para U+2218 Ring Operator
Mayúscula (Upper)
Simple Uppercase Mapping (suc) Glifo para U+2218 Ring Operator
Uppercase Mapping (uc) Glifo para U+2218 Ring Operator
Simple Titlecase Mapping (stc) Glifo para U+2218 Ring Operator
Titlecase Mapping (tc) Glifo para U+2218 Ring Operator
Case Folding (cf) Glifo para U+2218 Ring Operator
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi Control (Bidi_C)
Bidi Mirrored (Bidi_M)
Exclusión de descomposición (CE)
Case Ignorable (CI)
Changes When Casefolded (CWCF)
Changes When Casemapped (CWCM)
Changes When NFKC Casefolded (CWKCF)
Changes When Lowercased (CWL)
Changes When Titlecased (CWT)
Changes When Uppercased (CWU)
Cased (Cased)
Exclusión de composición completa (Comp_Ex)
Default Ignorable Code Point (DI)
Raya (Dash)
Deprecated (Dep)
Diacrítico (Dia)
Base de modificador de emoyi (EBase)
Componente de emoyi (EComp)
Modificador de emoyi (EMod)
Presentación de emoyi (EPres)
Emoyi (Emoji)
Extender (Ext)
Extended Pictographic (ExtPict)
FC NFKC Closure (FC_NFKC) Glifo para U+2218 Ring Operator
Grapheme Cluster Break (GCB) Any
Base de grafema (Gr_Base)
Extensión de grafema (Gr_Ext)
Enlace de grafema (Gr_Link)
Hex Digit (Hex)
Guion (Hyphen)
ID Continue (IDC)
ID Start (IDS)
IDS Binary Operator (IDSB)
IDS Trinary Operator and (IDST)
IDSU (IDSU) 0
ID_Compat_Math_Continue (ID_Compat_Math_Continue) 0
ID_Compat_Math_Start (ID_Compat_Math_Start) 0
Ideographic (Ideo)
InCB (InCB) None
Indic Mantra Category (InMC)
Indic Positional Category (InPC) NA
Indic Syllabic Category (InSC) Other
Jamo Short Name (JSN)
Join Control (Join_C)
Logical Order Exception (LOE)
Math (Math)
Noncharacter Code Point (NChar)
NFC Quick Check (NFC_QC)
NFD Quick Check (NFD_QC)
NFKC Casefold (NFKC_CF) Glifo para U+2218 Ring Operator
NFKC Quick Check (NFKC_QC)
NFKC_SCF (NFKC_SCF) Glifo para U+2218 Ring Operator
NFKD Quick Check (NFKD_QC)
Other Alphabetic (OAlpha)
Other Default Ignorable Code Point (ODI)
Otra extensión de grafema (OGr_Ext)
Other ID Continue (OIDC)
Other ID Start (OIDS)
Other Lowercase (OLower)
Other Math (OMath)
Other Uppercase (OUpper)
Prepended Concatenation Mark (PCM)
Pattern Syntax (Pat_Syn)
Pattern White Space (Pat_WS)
Comilla (QMark)
Indicador regional (RI)
Radical (Radical)
Salto de oración (SB) Other
Soft Dotted (SD)
Sentence Terminal (STerm)
Terminal Punctuation (Term)
Ideograma unificado (UIdeo)
Selector de variación (VS)
Salto de palabra (WB) Other
Espacio en blanco (WSpace)
XID Continue (XIDC)
XID Start (XIDS)
Expands On NFC (XO_NFC)
Expands On NFD (XO_NFD)
Expands On NFKC (XO_NFKC)
Expands On NFKD (XO_NFKD)
Bidi Paired Bracket (bpb) Glifo para U+2218 Ring Operator
Bidi Paired Bracket Type (bpt) None
East Asian Width (ea) neutral
Hangul Syllable Type (hst) Not Applicable
ISO 10646 Comment (isc)
Joining Group (jg) No_Joining_Group
Joining Type (jt) Non Joining
Line Break (lb) Alphabetic
Numeric Type (nt) none
Valor numérico (nv) not a number
Simple Case Folding (scf) Glifo para U+2218 Ring Operator
Script Extension (scx)
Orientación vertical (vo) R