U+03D1 "ϑ" Greek Theta Symbol Unicode Character

Unicode Version 17.0

ϑ

U+03D1 "ϑ" Greek Theta Symbol is a typographic variant of the Greek letter theta, distinct from the more common straight theta (Θ, θ) in that it features a curled, script-like form often resembling a circle with a horizontal line through its center or a stylized cursive loop. Historically, this symbol was used in ancient Greek cursive and later adopted in mathematical and technical contexts, particularly to represent a specific variant of the theta function or an angular coordinate in thermodynamics and geometry. In modern character sets, it is encoded separately as a "curled" or "script" theta to ensure precise representation in scholarly and scientific texts, distinguishing it from the standard theta in both uppercase and lowercase forms.

General Properties

Code Point U+03D1
Version Added 1.1
Name Greek Theta Symbol
Unicode 1.0 Name Greek Small Letter Script Theta
Block Greek and Coptic
General Category Lowercase Letter
Canonical Combining Class Not Reordered
Bidirectional Class Left To Right
Decomposition Type Compat
Decomposition Mapping "θ" U+03B8 Greek Small Letter Theta

Encodings

HTML Decimal Encoding ϑ
HTML Hex Encoding ϑ
UTF-8 Encoding 0xCF 0x91
UTF-16 Encoding 0x03D1
UTF-32 Encoding 0x000003D1
C/C++/Java Escape \u03d1

Unicode Properties

NFC Quick Check Yes
NFD Quick Check Yes
Numeric Type None
Numeric Value NaN
Line Break Alphabetic
Lowercase Yes
Simple Uppercase Code Point "Θ" U+0398 Greek Capital Letter Theta
Simple Titlecase Code Point "Θ" U+0398 Greek Capital Letter Theta
Uppercase Code Point "Θ" U+0398 Greek Capital Letter Theta
Titlecase Code Point "Θ" U+0398 Greek Capital Letter Theta
Simple Case Folding "θ" U+03B8 Greek Small Letter Theta
Case Folding "θ" U+03B8 Greek Small Letter Theta
Cased Yes
Changes When Casefolded Yes
Changes When Casemapped Yes
Changes When NFKC Casefolded Yes
Changes When Titlecased Yes
Changes When Uppercased Yes
NFKC Casefold "θ" U+03B8 Greek Small Letter Theta
NFKC Simple Casefold "θ" U+03B8 Greek Small Letter Theta
Script Greek
Script Extensions Greek
Indic Syllabic Category Other
ID Start Yes
XID Start Yes
ID Continue Yes
XID Continue Yes
Alphabetic Yes
Math Yes
Other Math Yes
Vertical Orientation Rotated
Grapheme Base Yes
Grapheme Cluster Break Other
Word Break Alphabetic letter
Sentence Break Lower