What does “a show of hands” mean?

a group of people each raising a hand to vote for or against sth

How is “a show of hands” used?

In 12 Angry Men (1957), one line is: “I guess the quickest way is a show of hands. Anyone object?”

The clip at the top of this page is from 12 Angry Men (1957).

I guess the quickest way is a show of hands. Anyone object?

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