Tracer

The term tracer (in the sense of "indicator" ) is used in many fields of application:

Tracer ( hydrology ) to explore flow paths and flow rates of surface and ground waters
Tracer (Meteorology) for visualization of air currents ( Stadtklimatiologie ); see tracer experiment
Tracer ( nuclear medicine) for tracking physiological processes in imaging procedures and laboratory tests
For the representation of program or protocol procedures (for example, ISDN - Monitor), see trace.
Tracer (air type) for verification of ventilation systems
Program for vectorizing a raster image into a vector graphic

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