Meaning
The same sound is found in the Arabic and other Semitic languages. The Arabs have two pronunciations, one a very strong guttural formed at the back of the palate, something like a rattled "r" or "rg," the other similar in quality, only less harsh and guttural. The Septuagint reproduced the `ayin (`) in some cases by the Greek letter gamma (g). The numerical value of this letter is 70. An `ayin (`) begins each verse of the 16th section of Psa 119 in the Hebrew.
W.W. Davies