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The En Mishpat Ner Mitzva on the Bavli (in the standard edition, anyway) refers to the Mishne Tora (Yad Hachazaka) as "מיי׳". What is this an abbreviation of? (I have an educated guess ("מיימוני"), but seek a strong argument or good evidence.)

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Maybe it's מי יודע – Daniel Dec 25 '13 at 0:01
Is there any way to know officially without a direct claim by whoever first used the abbreviation? – Double AA Dec 25 '13 at 0:11
note that two of the commentaries on the Rambam are named "הגהות מיימונית" and one named "תשובות מיימוניות" - hebrewbooks.org/39979 – Menachem Dec 25 '13 at 2:15
see Sefer Roshei Teivot hebrewbooks.org/pdfpager.aspx?req=34968&pgnum=167 – Menachem Dec 25 '13 at 2:27
Related?: judaism.stackexchange.com/q/6860/3 – WAF Dec 25 '13 at 12:06

It stand for מיימונידס‎ or מיימוני - Maimonides, i.e. the Rambam. I think they used this because it is the shortest way of referencing the Mishneh Torah.

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How do you know? The OP also guessed this, but he sought "a strong argument or good evidence" to support it. – Double AA Dec 25 '13 at 0:51
Shorter options ... מ"ת ... י"ד – Seth J Dec 25 '13 at 2:46

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