Both NL and NED (from the Dutch word Nederland) are in relatively common use.
The most common used abbreviation is NL. With for example sport events often NLD is used.
Holland is another name. The abbrev. is NED, as the D comes from the d in Nederland (dutch language).
It is SCO.
SD
It's yd
Missouri (MO)
Velocity= v.
rel. (religion)
COMPLEMENTS
Either "abbr." or "abbrev."
IOC IOC
The word agreement is not usually abbreviated. However, it could possibly be written as "ab", "abbrev", or "abb". The most common would probably be "abbrev".
The abbrev. For lake ontario is O.
cm - abbrev. for centimetre