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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