U+0398 "Θ" Greek Capital Letter Theta Unicode Character
Unicode Version 17.0
Θ
U+0398 "Θ" Greek Capital Letter Theta is the eighth letter of the Greek alphabet, historically representing an aspirated "t" sound in classical Greek and later evolving into the voiceless dental fricative "th" in modern Greek, as in the English word "think." It is widely used in mathematics and science, often denoting an angle in geometry or trigonometry, a temperature variable in thermodynamics, and a parameter in statistics. In physics, it can represent the theta function or scattering angles, while in engineering and technology, it appears in symbolic notation for phases or thresholds. Its distinctive circular shape with a horizontal bar makes it a recognizable symbol in academic and technical contexts across many disciplines.
General Properties
| Code Point | U+0398 |
| Version Added | 1.1 |
| Name | Greek Capital Letter Theta |
| Block | Greek and Coptic |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
Encodings
| HTML Decimal Encoding | Θ |
| HTML Hex Encoding | Θ |
| UTF-8 Encoding | 0xCE 0x98 |
| UTF-16 Encoding | 0x0398 |
| UTF-32 Encoding | 0x00000398 |
| C/C++/Java Escape | \u0398 |
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 |
| East Asian Width | Ambiguous |
| Uppercase | Yes |
| Simple Lowercase Code Point | "θ" U+03B8 Greek Small Letter Theta |
| Lowercase Code Point | "θ" U+03B8 Greek Small 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 Lowercased | Yes |
| Changes When NFKC Casefolded | 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 |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |