Where does “σχήματα” come from?

σχήματα (Ancient Greek) comes from Ancient Greek σχῆμα, from Ancient Greek ἔχω, from Proto-Hellenic hékʰō, from Proto-Indo-European seǵʰ- — to hold; to overpower.

σχήματα (Ancient Greek): nominative plural of σχῆμα; accusative plural of...