It's called the sole of the foot.
(Other areas on the sole of the foot are specifically called the ball of the foot, the arch of the foot, toes and heel)
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A fraction has two parts. On the top is the numerator, and on the bottom is the denominator. The line separating them is called the vinculum.
It is called a track
you might have your feet up in front of a fire or radiator
The number on the bottom of a fraction is known as the "denominator."
A foot fetish.