Columbia subject headings:
Abbreviations, English--Dictionaries.
Acronyms.
Signs and symbols--Dictionaries.
Harvard subject headings:
Abbreviations, English
Abbreviations, English--Dictionaries.
Acronyms
Signs and symbols--Dictionaries
Princeton subject headings:
Abbreviations, English--Dictionaries.
Acronyms--Dictionaries.
Dictionaries.
Signs and symbols--Dictionaries.