Omit periods with an abbreviation of solid compound words.
NW (northwest)
Omit periods with acronyms.
NATO
Omit periods with chemical symbols.
O (oxygen)
Omit periods with abbreviations of group names and licenses and certificates.
AIA (American Institute of Architects)
Omit periods with metric abbreviations.
6 mm
Omit periods with shortened word forms.
ad (advertisement)
Omit periods with letters used as letters or as words.
vitamin C R-30
piece A f/16
EXCEPTIONS:
B.S. degree
Ph.D. (no spaces)
p.m.
Abbreviations
Capitalization
Company Names
Dates and Times
Degrees and Certifications
Periods
Plurals
Spaces