MOO

MOO

1. (video games) Initialism of Master of Orion.

MOO

1. Initialism of matter of opinion.
2. (video games) Initialism of MUD, object-oriented.
3. (dated, Postal Romanization) Initialism of Money Order Office.
   • 1893, George A. de M. Edwin Dagg, "Devia Hibernia" : the road and route guide for Ireland of the Royal Irish Constabulary‎, page vi:

     […] (3) the nature of the Postal business accommodation supplied by the local Post-Office—thus, PO (Post-Office), SB (Savings Bank), MOO (Money Order Office), or, if there be no PO, the name and distance of the nearest PO […]

   • 1993, Christopher Browne, Getting the Message: The Story of the British Post Office‎, page 88:

     It was to help solve a serious problem – mice. For the little vermin were chewing letters containing banknotes and postal orders, especially at the Money Order Office (MOO).

4. (astronomy) Initialism of massive overdense object.

• OOM, omo-, oom