1.  Thēta is the eighth letter in the Greek alphabet.

2.  Thēta is an aspirate dental consonant. Its phoneme is formed with the tip of the tongue behind the upper teeth with its sound accompanied with an emission of breath. Its phoneme sounds like the "th" in "thing." It is never pronounced like the "th" as in "this."

3.  Thēta's upper and lower case letters look very similar. However, the upper case letter is formed by writing an "O" with a center stroke line. The lower case letter is written with one stroke without lifting the pen from the paper.

4.  Thēta is transliterated into English as "Th" or "th."