This answer, for instance

• Cal. or Calif., for California
• NASA, e.g.
• Mr., for example
• Common crossword clue tag
• What etc. is
• Short for short?
• This answer, e.g
• Common crossword clue letters
• Word's shortened form, for short

Wiktionary Word definitions in Wiktionary
n. (alternative spelling of abbr. dot= English).