hex ‧ a ‧ dec ‧ i ‧ mal /ˌheksəˈdesəm ə l◂, ˌheksəˈdesɪm ə l◂/ BrE AmE ( also hex ) adjective technical
[ Date: 1900-2000 ; Origin: hexa- 'six' (from Greek , from hex 'six' ) + decimal ]
hexadecimal numbers are based on the number 16 and are mainly used on computers