The voiceless dental non-sibilant fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is Voiceless dental fricative, and the equivalent X-SAMPA symbol is T . The IPA symbol is the Greek letter theta, which is used for this sound in Greek, and the sound is thus often referred to as "theta". It is familiar to English speakers as the 'th' in thing.
