ע Ayin - the 16th letter, Gematria 70
ע is a hard letter to pronounce for speakers of non-Semitic languages, if the Aramaic pronunciation is to be used.
Modern Hebrew has made it easy, by simply pronouncing it as א (Alef), when not immediately after a consonant or at the end of a word. In such cases, like א, it is silent in both Modern Hebrew and Aramaic.
In Aramaic, ע is pronounced like an א (Alef) deeper in the throat and with the throat constricted, as if an invisible hand is choking you. It is pronounced as Arabic ﻉ (Ayin), usually the less rough version of it. Some Jewish people will still pronounce ע like in Aramaic, even in Modern Hebrew.
The word for Eye in both Modern Hebrew and Aramaic is עין (Ayin). Fancy that.