Agilent Technologies N1911A Programming Manual page 103

Power Meter Remote Operation 1
<NAN> Definition
Not a number (NAN) is represented as 9.91 E37. Not a number is defined
in IEEE 754.
<non-decimal numeric> Definition
Throughout this document <non-decimal numeric> is used to represent
numeric information in bases other than ten (that is, hexadecimal, octal
and
binary). The following syntax diagram shows the standard for these three
data structures. For examples, #HA2F, #ha4e, #Q62, #q15, #B01011.
N1911A/1912A P-Series Power Meters Programming Guide 75