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"Start at the top and down you run, That’s the way to make a one!"
: Most commonly a single vertical line, sometimes with a serif at the top or a small bar at the base.
: In early learning, it’s often shown as a single dot on a die, one finger held up, or one tally mark. A Rhyme for Formation
: In math, it is called a "unit" and is the only number that is neither prime nor composite.