hallmark

Noun	1.	hallmark - a distinctive characteristic or attribute Synonyms: stylemark, trademark, earmark
	2.	hallmark - a mark on an article of trade to indicate its origin and authenticity Synonyms: assay-mark, authentication

aroma, attribute, authentication, badge, banner, billhead, book stamp, bookplate, brand, broad arrow, cachet, cast, character, characteristic, check, colophon, configuration, counterfoil, countermark, cut, device, differentia, differential, distinctive feature, docket, earmark, feature, figure, flavor, government mark, government stamp, gust, identification, idiocrasy, idiosyncrasy, image, impress, impression, imprint, index, indicant, indicator, individualism, insignia, keynote, label, letterhead, lineaments, logo, logotype, mannerism, mark, marking, masthead, measure, mold, nature, note, odor, particularity, peculiarity, picture, plate, price tag, property, quality, quirk, registered trademark, representation, representative, running head, running title, savor, seal, shape, sigil, sign, signal, signature, signet, singularity, smack, specialty, stamp, sticker, stub, sure sign, symbol, symptom, tab, tag, taint, tally, tang, taste, telltale sign, ticket, title page, token, trade name, trademark, trademark name, trait, trick, verification