Wiktionary
n. (context computing English) A number represented by the binary digits 0 and 1.
Wikipedia
In mathematics and digital electronics, a binary number is a number expressed in the binary numeral system or base-2 numeral system which represents numeric values using two different symbols: typically 0 (zero) and 1 (one). The base- 2 system is a positional notation with a radix of 2. Because of its straightforward implementation in digital electronic circuitry using logic gates, the binary system is used internally by almost all modern computers and computer-based devices. Each digit is referred to as a bit.
Usage examples of "binary number".
If the first letter is R, and its Baudot code is 01011, and the second letter is F, and its code is 10111, then I can simply combine the two into a ten-digit binary number, 0101110111.
A mathematician, doodling in his notebook, might quickly recognize them as forming a binary number.
This total viewed differently, as one zero one, or binary number five, was equally unimportant.
The information to specify the path from the starting point to any one of the terminal points increases by one bit for each decision and hence can be expressed as a binary number of 166 bits.
At this moment over a thousand immotile unit brains were now devoted to interpreting the alien electronics and the binary number sequences they used.
THE FLYER SPED LOW OVER THE SURFACE OF TITAN, GUIDED through the darkness by forward-scanning radars that felt the landscape with their electronic fingers and translated its contours into binary number-streams that the flight-control computers could understand.
This number can be represented as a five-digit binary number, that is, five ones or zeroes, or (more useful) five holes, or absences of holes, across a strip of paper tape.