predictor

Noun

• a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival

• information that supports a probabilistic estimate of future events
  • the weekly bulletin contains several predictors of mutual fund performance
    

• someone who makes predictions of the future (usually on the basis of special knowledge)

Related words

• Synonyms: 
  forecaster , prognosticator , soothsayer