Operator /(?)/

Op·er·a·tor

Operator

n.
  1. One who, or that which, operates or produces an effect.
  2. One who performs some act upon the human body by means of the hand, or with instruments. (Surg.)
  3. A dealer in stocks or any commodity for speculative purposes; a speculator. [Brokers' Cant]
  4. The symbol that expresses the operation to be performed; -- called also facient. (Math.)
  5. A person who operates a telephone switchboard.
  6. A person who schemes and maneuvers adroitly or deviously to achieve his/her purposes.