Is the electrical signal that typically moves from the cell body down the axon to the axon terminals.

Action potential is the electrical signal that typically moves from the cell body down the axon to the axon terminals.
There are other terms to refer to this, and those are impulse or spike. This is so because action potential is created when "the membrane potential of a specific axon location rapidly rises and falls," according to its definition.

What are the two subjects? :)