A History of Short Words

From the New York Times Crossword Puzzle

EXT

Sat, 19 Aug '23
Numbers after a no.
Wed, 31 May '23
No. after a phone number
Sat, 13 Aug '22
No. at the end of a telephone no.
Tue, 4 Jan '22
Screenplay abbr. indicating "outside"
Thu, 16 Dec '21
No. after a no.
Wed, 20 Oct '21
Office no.
Sun, 20 Jun '21
Business card abbr.
Sun, 30 May '21
Part of an office phone no.