Acer
patsy
If you're asking for a crossword puzzle, the answer is probably user.
crossword puzzle
If you are asking this question in regard to today's newspaper crossword puzzle, the answer is "atom".
olio
In crossword puzzles, brainwaves are "ideas."
APO
tram
lol are you doing a crossword puzzle
orlop
If it is referring to a 3 letter answer in a crossword puzzle it is "ete"
APO