indication manifestation mark sign warning expression evidence token augury portent omen proof clue hint testimony index indicia note signal significant syndrome suggestion indicator intimation pointer trace giveaway demonstration attestation symbol betrayal lead gesture inkling implication telltale guide flag badge cue prognostic flash signification vestige nod leak sigil stamp light beacon bell caution witness grounds disclosure display declaration signifier show exhibition support representation goods dope pledge forewarning revelation emblem recognition measure warrant presage security record register communication preamble explanation auspice wink wind notion reminder adumbration prolegomenon gauge barometer guideline gage model basis bellwether ratio rule indicant formula meter metre standard criterion