O.F.M.

1.
Order of Friars Minor (Franciscan).

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Of-mice-and-men
noun 1. a novel (1937) and play (1938) by John Steinbeck.
Of note
Important, of distinction, famous, as in I have nothing of note to report, or The speaker was a man of note. This idiom uses note in the sense of “importance” or “fame.” [ Late 1500s ]
Of old
Formerly, long since, at an earlier time, as in In days of old the whole town turned out to watch the parade. This somewhat archaic idiom dates from about 1400.