Noun

• S: (n) hallmark, trademark, earmark, stylemark (a distinctive characteristic or attribute)
• S: (n) trademark (a formally registered symbol identifying the manufacturer or distributor of a product)

Verb

• S: (v) brand, trademark, brandmark (mark with a brand or trademark) "when this product is not branded it sells for a lower price"
• S: (v) trademark (register the trademark of) "The company trademarked their new gadget"