It is a prefix for a value raised to the thirtieth power, such as 10³ 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 thousands, of three zeros, and hence the '30' because three zeros (000) by 10 gives the 10 followed by 30 zeros as it has the power of the example [note: in the case of the byte that is binary and always counts of thousands, a quettabyte does look like 2¹ 8304;]; and the name is modified to use a Q as its symbol, which had no previous use that could be confused. See quecto- .
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