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- - Close Punctuation
- Introduction to Punctuation
- Spacing
- The Period, Main purpose
- Imperatives, exclamations and indirect questions
- Ellipsis points
- Leaders
- Other uses
- Periods properly omitted
- The Question Mark, Main purpose
- Requests, indirect questions and other uses
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- Commas properly omitted
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7.08 Periods properly omitted
Do not use a period at the end of any form of heading (other than run-in sideheads), legend or the like, or after a date line or signature:
- Summary of Expenditures
- June 22, 1996
Short signboard messages do not require a final period:
- No Trespassing
- Employees Only
Do not use periods with acronyms and initialisms and with abbreviations of compass directions (except in street addresses that do not appear on envelopes or packages); degrees; memberships and distinctions; SI/metric unit symbols; chemical symbols; or mathematical abbreviations:
- BSc
- cm
- cos
- FRSC
- MA
- NaCl
- NATO
- NE
- OECD
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