Questions about the use of whitespace characters

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24
votes
3answers
35k views

Should there be a space before a percent sign?

Should there be a space before a percent sign or not? Should you write 20% or 20 %? I'm not sure if there is any consensus about this or not. Is one way more common than the other?
191
votes
15answers
26k views

How many spaces should come after a period/full stop?

In the past — or at least, when I was in elementary school — periods/full stops were followed by two spaces. Lately, it's become more and more common to see just one space. In the modern ...
14
votes
6answers
18k views

Should I write “comma/period” or “comma / period”?

I usually put a space before, and after / when indicating alternatives, such as in the following sentence. We review a module / theme per user. Is it correct, or should I re-write the sentence ...