A branch of aṣṭāṅga mahānimitta (the eightfold science of prognostication); it deals with foretelling of good or evil effect of the vibration or quivering of the parts of the body.
Aṃga-pratyaṃga-darśana-sparśanādibhistrikā- labhāvisukhaduḥkhādivibhāvanamaṅgam.(TaVā 3.36)