The number 218 in Judaism has multiple meanings, including the gematria of the phrase "mother to the world" and the gematria of the moon:
Gematria
The gematria of a word, phrase, or name is the numerical value assigned to it using an alphanumerical cipher. In Hebrew, the gematria of the phrase "mother to the world" (אמא לעולם) is 218, which is also the gematria of the moon.