[true_religion]

I had once thought the circle shape came from scantron style examination papers, where you can only fill one circle at a time. It’s similar even if the origins are probably different.

[vel0city]

A lot of Scantron-style systems (including a lot of Scantrons) support marking multiple.

[eesmith]

Yes, I had tests in the 1980s which were 'select all that apply'.