
1) Binary arithmetic
Found on
https://www.crosswordclues.com/clue/sign-bit

In computer science, the sign bit is a bit in a signed number representation that indicates the sign of a number. Only signed numeric data types have a sign bit, and its place is usually the leftmost, where the most significant bit in unsigned numbers resides. Floating point numbers in IEEE format are always signed, with the sign bit in the leftmo...
Found on
http://en.wikipedia.org/wiki/Sign_bit

The first bit in a dibit (group of two bits) in 2 binary, 1 quarternary (2B1Q) modulation. The sign bit determines if the voltage of the transmitted signal is positive or negative. The second bit is the magnitude bit, and it determines whether the voltage is positive or negative.
Found on
https://www.encyclo.co.uk/local/20850
No exact match found.