1) Activity centers 2) Centers 3) Centers of activity 4) Centers of concentration 5) Centers of focus 6) Centers of great activity 7) Centers of power 8) Central spots 9) Certain mathematical planes 10) Coil anagram 11) Collections of points in math 12) Exact places 13) Fixed points 14) Focal points Found on https://www.crosswordclues.com/clue/loci