Latin theta
Latin theta is an additional letter of the Latin script, based on the lowercase letter theta from the Greek alphabet. It is used in Cypriot Arabic, Gros Ventre, Comox, Fox, Thompson, Tuscarora, Halkomelem, Wakhi, Yavapai, Havasupai–Hualapai, and Romani. It also historically was used in the Lepsius Standard Alphabet.
Usage
The letter appears in the International Standard Alphabet of the Romani language, where it represents the voiceless alveolar plosive when placed after a vowel, and the voiced alveolar plosive when placed after a nasal consonant.In the Gros Ventre, Fox, and Comox languages, it represents the voiceless dental fricative sound.
It was used in the Lepsius Standard Alphabet created for transcription of Egyptian hieroglyphs and African languages. In it, it represented the voiceless dental fricative sound, before being replaced by the letter Ṯ.
Latin theta is also found in Cypriot Arabic and the Latin script for the Wakhi language.