Mathematics is a particularly important challenge for embodied approaches to cognition, as it is probably the most abstract domain of human knowledge. Humans use metaphors in all aspects of life. This paper studies the effects of human body parts on numerals, numeral systems, and mensural and sortal classifiers. The evidence for this paper comes from the Tāti language group, an endangered Iranian language of the Indo-European language family. The Tāti data shows these languages make use of base-10, base-20, and base-50 numeral systems, some of which are among the most common and earliest counting systems worldwide, while the last is unique and peculiar to the area. Body parts may also play an important role in forming mensural and sortal classifiers, as is the case in the Tāti language group.
