I've been going through some records (e.g. from the old Jewish cemetery in Worms, Germany) from the 1200's and 1300's, and I've noticed that the gematria for 16 is yud-vav, as opposed to tes-zayin. When and why was this switch incorporated and became mainstream? (I'm aware of the gematria for 15 being tes-vav universally, and I'm aware that it is because yud-hey is the Shem Hashem.)

  • related: judaism.stackexchange.com/questions/10682/…
    – Joel K
    Feb 6, 2022 at 12:13
  • I think "mainstream" is ill-defined when speaking about Halacha or a tradition. Different rabbis and different communities in different places adopted it differently, over about a millennia. IIRC even some Rishonim use יה or יו in their interpretations. BTW, check the festival of טו בשבט.
    – Al Berko
    Feb 6, 2022 at 21:07
  • 1
    I think the Rashba uses יו.
    – pcoz
    Feb 8, 2022 at 1:04
  • I believe within Kabbalistic literature the י-ו combination is used in description of Hashem's Name (it being two of the letters of the Four Letter Name, same as י-ה is).
    – Yehuda
    Feb 8, 2022 at 17:42


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