Mts. is the abbreviation for mountains.
HQ is the correct abbreviation.
correct abbreviation for sounds
The correct abbreviation for October is: Oct.
The correct abbreviation for the word Sunday is "Sun."
abv
There is no abbreviation.
The correct abbreviation for a diploma in criminology is Dip.Crim.
The correct abbreviation for "I have" is I've.
Corr.
The abbreviation for gallbladder is GB
Xmas is the abbreviation of Christmas.