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capitalization: terms indicating time or sequence

Capitalize common singular nouns and abbreviations when they are followed by a date, number or letter denoting time or sequence or used for the purpose of reference:

  • It’s Day 15 of the election campaign.
  • The shortest route from Toronto to Montréal is along Highway 401.
  • Workshop 2 – Rm. 809
  • See App. A.

Some idiomatic expressions containing common nouns followed by a letter or number are also capitalized. The numbers in such expressions are often spelled out:

  • Back to Square One.
  • He’s on Cloud Nine.