The glyph is a compatibility version of the glyph Glifo para U+0398Greek Capital Letter Theta. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+03F4 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
El Wikipedia tiene la siguiente información acerca de este punto de código:
Theta (UK: , US: ) uppercase Θ or ϴ; lowercase θ or ϑ; Ancient Greek: θῆταthē̂ta[tʰɛ̂ːta]; Modern: θήταthī́ta[ˈθita]) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth . In the system of Greek numerals, it has a value of 9.