U+22A5 UP TACK

U+22A5 was added to Unicode in version 1.1 (1993). It belongs to the block Mathematical Operators in the Basic Multilingual Plane.

This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as base and bottom.

The glyph is not a composition. It has a Ambiguous East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. The glyph can, under circumstances, be confused with 5 other glyphs. In text U+22A5 behaves as Ambiguous 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:

The up tack or falsum (, \bot in LaTeX, U+22A5 in Unicode) is a constant symbol used to represent:

  • The bottom element in lattice theory
  • The bottom type in type theory
  • A logical constant denoting contradiction in logic (false)

The glyph of the up tack appears as an upside-down tee symbol, and as such is sometimes called eet (the word "tee" in reverse).

The tee (⊤), also called down tack, plays a complementary or dual role in many of these theories.

The similar-looking perpendicular symbol (, \perp in LaTeX, U+27C2 in Unicode) is a binary relation symbol used to represent:

  • Perpendicularity of lines in geometry
  • Orthogonality in linear algebra
  • Independence of random variables in probability theory
  • Comparability in order theory
  • Coprimality in number theory

Representations

System Representation
8869
UTF-8 E2 8A A5
UTF-16 22 A5
UTF-32 00 00 22 A5
URL-Quoted %E2%8A%A5
HTML-Escape ⊥
Wrong windows-1252 Mojibake ⊥
HTML-Escape ⊥
HTML-Escape ⊥
HTML-Escape ⊥
HTML-Escape ⊥
digraph -T
alias base
alias bottom
LaTeX \perp
Encoding: EUC-KR (hex bytes) A1 D1
Encoding: JIS0208 (hex bytes) A2 DD
Encoding: JIS0208 (hex bytes) AD F6

Related Characters

Confusables

  • ꓕ
  • ⊥
  • ⟂
  • ꓕ
  • Ʇ

Elsewhere

Complete Record

Property Value
Age (age) 1.1
Unicode Name (na) UP TACK
Unicode 1 Name (na1)
Block (blk) Math_Operators
General Category (gc) Math Symbol
Script (sc) Common
Bidirectional Category (bc) Other Neutral
Combining Class (ccc) Not Reordered
Decomposition Type (dt) None
Decomposition Mapping (dm) ⊥
Lowercase (Lower)
Simple Lowercase Mapping (slc) ⊥
Lowercase Mapping (lc) ⊥
Uppercase (Upper)
Simple Uppercase Mapping (suc) ⊥
Uppercase Mapping (uc) ⊥
Simple Titlecase Mapping (stc) ⊥
Titlecase Mapping (tc) ⊥
Case Folding (cf) ⊥
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi Control (Bidi_C)
Bidi Mirrored (Bidi_M)
Bidi Paired Bracket (bpb) ⊥
Bidi Paired Bracket Type (bpt) None
Cased (Cased)
Composition Exclusion (CE)
Case Ignorable (CI)
Full Composition Exclusion (Comp_Ex)
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)
Dash (Dash)
Deprecated (Dep)
Default Ignorable Code Point (DI)
Diacritic (Dia)
East Asian Width (ea) Ambiguous
Extender (Ext)
FC NFKC Closure (FC_NFKC) ⊥
Grapheme Cluster Break (GCB) Any
Grapheme Base (Gr_Base)
Grapheme Extend (Gr_Ext)
Hex Digit (Hex)
Hangul Syllable Type (hst) Not Applicable
Hyphen (Hyphen)
ID Continue (IDC)
Ideographic (Ideo)
ID Start (IDS)
IDS Binary Operator (IDSB)
IDS Trinary Operator and (IDST)
InMC (InMC)
Indic Positional Category (InPC) NA
Indic Syllabic Category (InSC) Other
ISO 10646 Comment (isc)
Joining Group (jg) No_Joining_Group
Join Control (Join_C)
Jamo Short Name (JSN)
Joining Type (jt) Non Joining
Line Break (lb) Ambiguous
Logical Order Exception (LOE)
Math (Math)
Noncharacter Code Point (NChar)
NFC Quick Check (NFC_QC) Yes
NFD Quick Check (NFD_QC) Yes
NFKC Casefold (NFKC_CF) ⊥
NFKC Quick Check (NFKC_QC) Yes
NFKD Quick Check (NFKD_QC) Yes
Numeric Type (nt) None
Numeric Value (nv) NaN
Other Alphabetic (OAlpha)
Other Default Ignorable Code Point (ODI)
Other Grapheme Extend (OGr_Ext)
Other ID Continue (OIDC)
Other ID Start (OIDS)
Other Lowercase (OLower)
Other Math (OMath)
Other Uppercase (OUpper)
Pattern Syntax (Pat_Syn)
Pattern White Space (Pat_WS)
Quotation Mark (QMark)
Radical (Radical)
Sentence Break (SB) Other
Simple Case Folding (scf) ⊥
Script Extension (scx) Common
Soft Dotted (SD)
STerm (STerm)
Terminal Punctuation (Term)
Unified Ideograph (UIdeo)
Variation Selector (VS)
Word Break (WB) Other
White Space (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)