The question isn't very clear but maybe the answer is Newton's 3rd law of motion which is often summarised as: " for every action there is an equal and opposite reaction"
Sorry factor, I think this was a clue from Saturday's Telegraph Gk crossword.
Symmetry fitted the letters but was a bit of a vague answer for the clue.
Thanks calibax.
Hi welchwales- it would help if you could start including details of letters and the name of the crossword when you post crossword questions
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