The abbreviation for both is Mr.
Mr for 'Mister',Sig. for 'Signore'.
Mr.
abbreviate "Master Sergeant retired
Master is used without abbreviation.
A Master of Divinity degree is an M.Div
MA in Ed.
The abbreviation for Master's of Science in Psychology is M.S. in Psychology.
m.a.c.m. i think
MMOAS
You would normally abbreviate the title of someone who has attained the degree of Master of the Arts as M.A.
Commonly, it is a short form for "Mister" or "Master".
A man servant.