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I still find people who do this
(slrpnk.net)
At my last job, a bunch of the older folks did not realize they had a "two spaces" habit.
It's a clear tell.
Saw this meme and thought I'd point that out.
Double-spaced refers to line spacing to leave room for notes. I don't think period-spacing exists. It seems like people correcting a behavior incorrectly so prevalently that now it's just something some people do, which is humorous.