trade ‧ mark /ˈtreɪdmɑːk $ -mɑːrk/ BrE AmE noun [countable]
1 . a special name, sign, or word that is marked on a product to show that it is made by a particular company, that cannot be used by any other company
2 . a particular way of behaving, dressing etc by which someone or something can be easily recognized:
The striped T-shirt became the comedian’s trademark.