The hallux, commonly referred to as the big toe (also as great toe or thumb toe), even though it's not actually the biggest toe on the foot of some people, is the innermost toe of the foot. It is counted as digit I (one). The name stems from the Latin for the same, similar to the pollex, which refers to the thumb.
In humans, the hallux is longer than the second or pointer toe for a majority of people. This is an inherited trait in humans, where the dominant gene causes the normal length hallux while the homozygous recessive genotype presents with a longer second toe. (Commonly known as "mitten foot" or "Morton's toe"). People with the rare genetic disease fibrodysplasia ossificans progressiva characteristically have short big toes.
The hallux is also used for balance in the human body.