Abbreviations

Capitalization

Capitalize abbreviations when the word or words represented would ordinarily be capitalized.
Btu (British thermal unit)

Capitalize abbreviations when the abbreviation itself has become established as a capital.
         TV
         VCR
         CD (on 2nd reference; spell out on first reference)
         No., Nos.

Abbreviations
Capitalization
Company Names
Dates and Times
Degrees and Certifications
Periods
Plurals
Spaces

See also Capitalization.

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