Trademark :  (noun)
1: a distinctive characteristic or attribute [syn: hallmark, earmark, stylemark]
2: a formally registered symbol identifying the manufacturer or distributor of a product

acknowledgment, billhead, book stamp, bookplate, brand, broad arrow, by-line, cachet, certificate of invention, check, citation, colophon, confession, copyright, counterfoil, countermark, credit line, docket, government mark, government stamp, habit, hallmark, idiosyncrasy, imprint, label, letterhead, logo, logotype, mannerism, masthead, minauderie, patent, peculiar trait, peculiarity, plate, price tag, quirk, reference, registered trademark, running head, running title, seal, service mark, sigil, signature, signet, stamp, sticker, stub, tag, tally, ticket, title page, token, trade name, trademark name, tribute, trick, trick of behavior,