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
TheE moo TH is pronounced like the TH in the word "thought" or "think" not like "then" or "this" theE moo
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.
The dipthong "th".
The letter: F (pronounced 'ef') lower case: f
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For modern Greek alphabet: Alpha, Beta, Gamma, Delta, Epsilon, Zeta, Eta, Theta, Iota, Kappa, Lambda, Mu, Nu, Xi, Omicron, Pi, Rho, Sigma, Tau, Upsilon, Phi, Chi, Psi, Omega. (Al- Fa), (Ba-ta), (Gam- ma), (Del- ta), (Ep-sill-on), (Za- ta), (A-ta), (Thay- ta), (I-ota), (Cap- a), (Lamb- duh), (Moo), (New) (Zee), (Omi- cron), (Pie), (Row), (Sig- ma), (Tow), (Up- sill- on), (Fi), (Kai), (Pa-sigh), (O-may- ga) The pronunciation of the names of the letters are: alfa, veeta, gama, delta, epsilon, zeeta, eeta, theeta, eota, kapa, lamda, mee, nee, ksee, omikron, pee, ro, seegma, taf, eepseelon, fee, khee, psee, omega. Now how the greeks pronounce each letter when these are part of a word: a, v, g, d, e (as in ever), z, ee (as in equal), th, e (as in equal), k, l, m, n, ks, o (as in open), p, r, s, t, ee (as in equal), f, kh, ps, o (as in open). Trust me, i'm greek :)