Seaman apprentice
Those are abbreviations for Colorado (CO), Kansas (KS), Oklahoma (OK) and Arkansas(AR).
Never Again Volunteer Yourself
In the United States Navy, the abbreviation LT before a sailor's name indicates that the sailor has the rank of Lieutenant (also abbreviated LT, Lieut, and LEUT).
Abbreviations
distal
ATS
what does DOM mean
most home plans using abbreviations (to keep the plan from being cluttered) will have a table that explains the abbreviations
ar = on
ar
It depends on what you mean by a "group of abbreviations". If you mean several abbreviations chained together to form something that looks like a word (like SCUBA and RADAR), it's an Acronym. If you mean something like an alphabetical listing of abbreviations, that's usually called a glossary (although that particular term covers a lot of ground...)