An acronym is an invented combination of letters.
Each letter is a cue to, or suggests, an item you need to remember.
PEMDAS, sequence in solving or evaluating math equations
Parenthesis | Exponents | Multiplication | Division | Addition | Subtraction
ROY G. BIV, the colors of the visible spectrum
Red, Orange, Yellow, Green, Blue, Indigo, Violet
IPMAT, the stages of cell division
Interphase, Prophase, Metaphase, Anaphase, Telephase