The 24th and last one.
Θ, θ [theta, pronounced as "th" in "think"]
A letter of the Greek alphabet corresponding to th in English; -- sometimes called the unlucky letter, from being used by the judges on their ballots in passing condemnation on a prisoner, it being the first letter of the Greek qa`natos, death.
theta
Theta for the sound of th in "thin;" delta for the sound of th in "this."
Actually "ena" is not a letter but a number. So after ena (one) comes thio (two, pronouncing "th" like in the word "then") If on the other hand meant the first letter of greek alphabet then that's a (alfa) and next comes β (vita)
Voiceless "th" is given the Greek letter Theta, like the picture at the following link. This is used in words like "thin" and "thermometer."Example of Theta:http://upload.wikimedia.org/wikipedia/commons/d/de/Greek_lc_theta.png
Riddle Answers:The letter you send to a friend.The letter 'c' is not in 'the alphabet,' nor are most of the other letters of the alphabet!Alphabet History Answer:There are many letters that were used in the past but which are no longer in the standard English alphabet.e.g.The letter thorn, or þorn (Þ, þ), an Anglo-Saxon letter. It has the unvoiced 'th' sound, i.e. as the th in 'Thursday'.The letter eth (Ð, ð; also spelled edh or eð) is another old letter, Old English, in fact. It also has a 'th' sound, but is voiced, i.e. as the th in 'the'.For references, see 'Related links' below.
TheE moo TH is pronounced like the TH in the word "thought" or "think" not like "then" or "this" theE moo
The dipthong "th".
The letter: F (pronounced 'ef') lower case: f
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The Greek alphabet is pronounced in its native form, with each letter having a specific sound. For example, the letter "alpha" is pronounced as "AH-lfah" and the letter "omega" is pronounced as "oh-MEH-gah". It is advisable to listen to native speakers or language resources to perfect the pronunciation of each letter.