In other branches (for example, Balto-Slavic and Indo-Iranian), the labiovelars merged with the velars: PIE *keup- became Vedic Sanskrit kopáyati "shaken" and *kʷo- became Avestan kō "who?"; but *ḱm̥tom became Avestan satəm. They are known as satem branches, after the Avestan word for hundred.[1][2]