sure sign definitions

Moby Thesaurus

absolute indication, badge, banner, burden of proof, character, characteristic, conclusive evidence, damning evidence, demonstration, determination, device, differentia, earmark, establishment, hallmark, idiosyncrasy, image, incontrovertible evidence, index, indicant, indicator, indisputable evidence, insignia, ironclad proof, keynote, mark, measure, note, onus, onus probandi, peculiarity, picture, proof, property, representation, representative, seal, settlement, sigil, sign, signal, signature, stamp, symptom, telltale sign, trait, unmistakable sign