Definition/Meaning  Word/Phrase 
positional system of numeration that uses binary digits and a radix of two 
binary number system
,
binary numeration system
,
binary system
,
pure binary numeration system

positional system of numeration that uses duodecimal digits and a radix of twelve 
duodecimal number system
,
duodecimal system

average number of binary digits needed to express one radix digit in a numeration system that is not binary; on the average a number that can be expressed in N decimal digits takes 3.3N binary digits 
equivalentbinarydigit factor

radix numeration system in which the location of the decimal point is fixed by convention 
fixedpoint notation
,
fixedpoint representation system

radix numeration system in which the location of the decimal point is indicated by an exponent of the radix; in the floatingpoint representation system, 0.0012 is represented as 0.122 where 2 is the exponent 
floatingpoint notation
,
floatingpoint representation system

positional system of numeration that uses hexadecimal digits and a radix of sixteen 
hexadecimal number system
,
hexadecimal system
,
sexadecimal number system

positional system of numeration that uses octal digits and a radix of eight 
octal number system
,
octal numeration system
