U+03DA "Ϛ" Greek Letter Stigma Unicode Character

U+03DA "Ϛ" Greek Letter Stigma is a historical ligature in the Greek alphabet, originally formed from the combination of sigma and tau, often used in medieval manuscripts to represent the sound /st/. It should not be confused with the similar-looking digamma or final sigma, as stigma has its own distinct uppercase form (U+03D9 "ϛ") and primarily appears in archaic or liturgical contexts, such as in Greek numerals where it stands for the number 6. While now largely obsolete in modern Greek writing, it persists in certain typographic and scholarly settings.

General Properties

Code Point	U+03DA
Version Added	1.1
Name	Greek Letter Stigma
Unicode 1.0 Name	Greek Capital Letter Stigma
Block	Greek and Coptic
General Category	Uppercase Letter
Canonical Combining Class	Not Reordered
Bidirectional Class	Left To Right

Encodings

HTML Decimal Encoding	Ϛ
HTML Hex Encoding	Ϛ
UTF-8 Encoding	0xCF 0x9A
UTF-16 Encoding	0x03DA
UTF-32 Encoding	0x000003DA
C/C++/Java Escape	\u03da

Unicode Properties

NFC Quick Check	Yes
NFD Quick Check	Yes
NFKC Quick Check	Yes
NFKD Quick Check	Yes
Numeric Type	None
Numeric Value	NaN
Line Break	Alphabetic
Uppercase	Yes
Simple Lowercase Code Point	"ϛ" U+03DB Greek Small Letter Stigma
Lowercase Code Point	"ϛ" U+03DB Greek Small Letter Stigma
Simple Case Folding	"ϛ" U+03DB Greek Small Letter Stigma
Case Folding	"ϛ" U+03DB Greek Small Letter Stigma
Cased	Yes
Changes When Casefolded	Yes
Changes When Casemapped	Yes
Changes When Lowercased	Yes
Changes When NFKC Casefolded	Yes
NFKC Casefold	"ϛ" U+03DB Greek Small Letter Stigma
NFKC Simple Casefold	"ϛ" U+03DB Greek Small Letter Stigma
Script	Greek
Script Extensions	Greek
Indic Syllabic Category	Other
ID Start	Yes
XID Start	Yes
ID Continue	Yes
XID Continue	Yes
Alphabetic	Yes
Vertical Orientation	Rotated
Grapheme Base	Yes
Grapheme Cluster Break	Other
Word Break	Alphabetic letter
Sentence Break	Upper