Webster's English Dictionary

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indicator

in.di.ca.tor \'in-d*-.ka:t-*r\ \in-'dik-*-.to-r-e-, -.to.r\ n 1: one that 
   indicates : as  1a: an index hand (as on a dial) : POINTER  1b1: a pressure 
   gauge  1b2: an instrument for automatically making a diagram that indicates 
   the pr essure in and volume of the working fluid of an engine throughout 
   the cycle 1c: a dial that registers (as the movement of an elevator)  2a: a 
   substance used to show visually (as by change of color) the condition  of a 
   solution with respect to the presence of free acid, alkali, or other 
   substance 2b: TRACER  3: an organism or ecological community so strictly 
   associated with particul ar environmental conditions that its presence is 
   indicative of the existence of these conditions - in.dic.a.to.ry aj