Adjust flag
The Adjust flag ( AF ) is a CPU flag in the FLAGS register of all x86-compatible CPUs , and the preceding 8080-family; it is also called the Auxiliary flag and the Auxiliary Carry flag ( AC , though this may be confused with the Alignment Check register ) . 
<triplet> FLAGS register <subj> CPU flag <obj> instance of <subj> x86 <obj> instruction set