Type[2 ]
Description
Strength
Directionality
General scope
Bidi_Control character[3 ]
L Left-to-Right
Strong L-to-R
Most alphabetic and syllabic characters, Chinese characters, non-European or non-Arabic digits, LRM character, ...
U+200E LEFT-TO-RIGHT MARK (LRM)
R Right-to-Left
Strong R-to-L
Adlam, Hebrew, Mandaic, Mende Kikakui, N'Ko, Samaritan, ancient scripts like Kharoshthi and Nabataean, RLM character, ...
U+200F RIGHT-TO-LEFT MARK (RLM)
AL Arabic Letter
Strong R-to-L
Arabic, Hanifi Rohingya, Sogdian, Syriac, and Thaana alphabets, and most punctuation specific to those scripts, ALM character, ...
U+061C ARABIC LETTER MARK (ALM)
EN European Number
Weak European digits, Eastern Arabic-Indic digits, Coptic epact numbers, ...
ES European Separator
Weak plus sign , minus sign , ...
ET European Number Terminator
Weak degree sign , currency symbols, ...
AN Arabic Number
Weak Arabic-Indic digits, Arabic decimal and thousands separators, Rumi digits, Hanifi Rohingya digits, ...
CS Common Number Separator
Weak colon , comma , full stop , no-break space , ...
NSM
Nonspacing Mark
Weak Characters in General Categories Mark, nonspacing, and Mark, enclosing (Mn, Me)
BN Boundary Neutral
Weak Default ignorables, non-characters, control characters other than those explicitly given other types
B Paragraph Separator
Neutral paragraph separator , appropriate Newline Functions, higher-level protocol paragraph determination
S Segment Separator
Neutral Tabs
WS Whitespace
Neutral space , figure space , line separator , form feed , General Punctuation block spaces (smaller set than the Unicode whitespace list)
ON Other Neutrals
Neutral All other characters, including object replacement character
LRE
Left-to-Right Embedding
Explicit L-to-R
LRE character only
U+202A LEFT-TO-RIGHT EMBEDDING (LRE)
LRO
Left-to-Right Override
Explicit L-to-R
LRO character only
U+202D LEFT-TO-RIGHT OVERRIDE (LRO)
RLE
Right-to-Left Embedding
Explicit R-to-L
RLE character only
U+202B RIGHT-TO-LEFT EMBEDDING (RLE)
RLO
Right-to-Left Override
Explicit R-to-L
RLO character only
U+202E RIGHT-TO-LEFT OVERRIDE (RLO)
PDF
Pop Directional Format
Explicit PDF character only
U+202C POP DIRECTIONAL FORMATTING (PDF)
LRI
Left-to-Right Isolate
Explicit L-to-R
LRI character only
U+2066 LEFT-TO-RIGHT ISOLATE (LRI)
RLI
Right-to-Left Isolate
Explicit R-to-L
RLI character only
U+2067 RIGHT-TO-LEFT ISOLATE (RLI)
FSI
First Strong Isolate
Explicit FSI character only
U+2068 FIRST STRONG ISOLATE (FSI)
PDI
Pop Directional Isolate
Explicit PDI character only
U+2069 POP DIRECTIONAL ISOLATE (PDI)
Notes
1.^ Unicode Bidirectional Algorithm (UAX#9) , As of Unicode version 12.0
2.^ Possible Bidirectional character types for character property: Bidi_Class or 'type'
3.^ Bidi_Control characters : Twelve Bidi_Control formatting characters are defined. They are invisible, and have no effect apart from directionality. Nine of them have a unique, overruling BiDi-type that is used by the algorithm. Their type is also their acronym (e.g. character 'LRE' has BiDi type 'LRE').
