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That depends on how you're using it.

As PART OF a title, it's usually abbreviated "M", as in "Master of Science" : "MS" or "Master Sergeant" : "MSG/MSgt".
As a title in its own right (used for young boys), it's either "M." or "MSTR" or "there isn't one, write out 'Master' in full" depending on who you ask.

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8y ago

What else can I help you with?