It is a prefix for a value raised to the thirtieth negative power, such as 10 8315;³ 8304; . It is taken from Greek 948; 949; 954; 945; ( deka "ten" ) , and this needs two explanations : first, the 10 is because it counts groups of thousandths, three zeros for decimals, and hence '30' because three zeros for decimal (0, 000) by 10 gives 1/1000¹ 8304; , or what is the same 0 , 000 82''000 82''000 82''000 82''000 82''000 82''000 82''000 82''000 82''001; and the name is modified to use a q as its symbol, which had no previous use that could be confused.