U+21ED UPWARDS WHITE ARROW ON PEDESTAL WITH VERTICAL BAR

U+21ED was added to Unicode in version 3.0 (1999). It belongs to the block Arrows in the Basic Multilingual Plane.

This character is a Other Symbol and is commonly used, that is, in no specific script. The character is also known as numeric lock.

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+21ED 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:

Num Lock or Number Lock () is a key on the numeric keypad of most computer keyboards. It is a lock key, like Caps Lock and Scroll Lock. Its state (on or off) affects the function of some of the keys, and is commonly displayed by an LED built into the keyboard.

The Num Lock key exists because earlier 84-key IBM PC keyboards did not have arrows separate from the numeric keypad. Num Lock would be used to choose between the two functions. On some laptop computers, the Num Lock key is used to convert part of the main keyboard to act as a (slightly skewed) numeric keypad rather than letters. On some laptop computers, the Num Lock key is absent and replaced by the use of a key combination.

Since most modern desktop computers have a full-size keyboard with both a numeric pad and separate arrow keys, Num Lock is rarely used for its original purpose, and ends up confusing the user if it has for some reason been activated without the user being aware of this. This can be more of an issue on most laptop computers, since activating the Num Lock function typically requires use of the Fn key and if a user accidentally switches it on they may have no idea how to switch it off. If a full-size keyboard is plugged into a laptop, then the Num Lock function is normally off, and the user would have to activate the Num Lock function to use the numeric keypad for numeric entry. Since Apple keyboards have always had dedicated arrow keys, Apple has keyboards with a separate numeric keypad but no functional Num Lock key. Instead, these keyboards include a Clear key.

Representations

System Representation
8685
UTF-8 E2 87 AD
UTF-16 21 ED
UTF-32 00 00 21 ED
URL-Quoted %E2%87%AD
HTML-Escape ⇭
Wrong windows-1252 Mojibake ⇭
alias numeric lock

Elsewhere

Complete Record

Property Value
Age (age) 3.0
Unicode Name (na) UPWARDS WHITE ARROW ON PEDESTAL WITH VERTICAL BAR
Unicode 1 Name (na1)
Block (blk) Arrows
General Category (gc) Other 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) Neutral
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) Alphabetic
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)