Hebrew and Greek gematria

The English word "gematria" is from the ancient Greek word "γεωμετρία" ≈ "geometry".
Greek dropped some Hebrew/Phonecian letters (except for numbers) as unneeded or duplicate sounds.

The Hebrew and Greek languages had numerical values for most of their letters. These values are well established. Analyzing and conjecturing about the resulting values of words, phrases, and sentences is a field called gematria.

More: Hebrew alphabet

The modern Greek word "γεωμετρία" (y-o-meh-TREE-a) ≈ "geometry".

Here are some Hebrew gematria values.

Note that there are some additional values at the high end but those are not needed here. A well-known example of Hebrew gematria is the Hebrew word "חי" (chai) ≈ "alive". חי - alive

"ח" = 8
"י" = 10

From the table, one can see that the gematria value is 18. The number 18 is a "lucky number" for Jewish people.

Here are some Greek gematria values. There are some additional values at the high end but those are not needed here.

The values for 6 (Digamma), 90 (Qoppa), and 900 (Sampi, not shown) represent characters that by Biblical times were no longer used for words, only for numbers. The sounds for each were either not needed or could be represented using other Greek letters.

Revelation 13:18 Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six. [kjv]

…εξακοσιοι εξηκοντα εξ [gnt]

The Greek Bible has one Digamma in it, the one used in the 6 for the number 666 in Revelation 13:8 as the "number of the beast".

A well-known example of Greek gematria is "χξς" (lowercase) or "ΧΞϜ" (uppercase) which is the number 666 from Revelation 13:18, also known as the "number of the beast".

600 = "χ" = "Χ"
60 = "ξ" = "Ξ"
6 = "Ϛ" = "Ϝ"

Note: This digamma is not in some Greek manuscripts.

Revelation 13:18

All

KJV: Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.

Greek: ωδε η σοφια εστιν ο εχων τον νουν ψηφισατω τον αριθμον του θηριου αριθμος γαρ ανθρωπου εστιν και ο αριθμος αυτου χξς εξακοσιοι εξηκοντα εξ

Latin: hic sapientia est qui habet intellectum conputet numerum bestiae numerus enim hominis est et numerus eius est sescenti sexaginta sex

Tyndale: Here is wisdome. Let him that hath wytt count the nombre of the beest. For it is the nombre of a man and his nombre is sixe hondred threscore and sixe.

Luther: Hier ist Weisheit. Wer Verstand hat, der überlege die Zahl des Tieres; denn es ist eines Menschen Zahl, und seine Zahl ist sechshundert und sechsundsechzig.

Russian: Здесь мудрость. Кто имеет ум, тот сочти число зверя, ибо это число человеческое; число его шестьсот шестьдесят шесть.