Home: go to the homepage U+2300 to U+23FF Miscellaneous Technical
Glyph for U+2391
Source: Noto Sans Symbols

U+2391 Passive-Pull-Down-Output Symbol

U+2391 was added to Unicode in version 3.0 (1999). It belongs to the block U+2300 to U+23FF Miscellaneous Technical 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+2391 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:

Open collector, open drain, open emitter, and open source refer to integrated circuit (IC) output pin configurations that process the IC's internal function though a transistor with an exposed terminal that is internally unconnected (i.e. "open"). One of the IC's internal high or low voltage rails typically connects to another terminal of that transistor. When the transistor is off, the output is internally disconnected from any internal power rail, a state called "high-impedance" (Hi-Z). Open outputs configurations thus differ from push–pull outputs, which use a pair of transistors to output a specific voltage or current.

These open outputs configurations are often used for digital applications when the transistor acts as a switch, to allow for logic-level conversion, wired-logic connections, and line sharing. External pull-up/down resistors are typically required to set the output during the Hi-Z state to a specific voltage. Analog applications include analog weighting, summing, limiting, and digital-to-analog converters.

The NPN BJT (n-type bipolar junction transistor) and nMOS (n-type metal oxide semiconductor field effect transistor) have greater conductance than their PNP and pMOS relatives, so may be more commonly used for these outputs. Open outputs using PNP and pMOS transistors will use the opposite internal voltage rail used by NPN and nMOS transistors.

Representations

System Representation
9105
UTF-8 E2 8E 91
UTF-16 23 91
UTF-32 00 00 23 91
URL-Quoted %E2%8E%91
HTML hex reference ⎑
Wrong windows-1252 Mojibake ⎑

Elsewhere

Complete Record

Property Value
Age 3.0 (1999)
Unicode Name PASSIVE-PULL-DOWN-OUTPUT SYMBOL
Unicode 1 Name
Block Miscellaneous Technical
General Category Other Symbol
Script Common
Bidirectional Category Other Neutral
Combining Class Not Reordered
Decomposition Type None
Decomposition Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Lowercase
Simple Lowercase Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Lowercase Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Uppercase
Simple Uppercase Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Uppercase Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Simple Titlecase Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Titlecase Mapping Glyph for U+2391 Passive-Pull-Down-Output Symbol
Case Folding Glyph for U+2391 Passive-Pull-Down-Output Symbol
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+2391 Passive-Pull-Down-Output Symbol
Grapheme Cluster Break Any
Grapheme Base
Grapheme Extend
Grapheme Link
Hex Digit
Hyphen
ID Continue
ID Start
IDS Binary Operator
IDS Trinary Operator and
IDSU 0
ID_Compat_Math_Continue 0
ID_Compat_Math_Start 0
Ideographic
InCB None
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+2391 Passive-Pull-Down-Output Symbol
NFKC Quick Check Yes
NFKC_SCF Glyph for U+2391 Passive-Pull-Down-Output Symbol
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+2391 Passive-Pull-Down-Output Symbol
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+2391 Passive-Pull-Down-Output Symbol
Script Extension
Vertical Orientation U