a word, phrase, or symbol that is legally established as representing a particular product or company;
e.g. The company prints its trademark on all of its products.
(noun)
broadly, a feature or characteristic that is distinctive to something or someone;
e.g. This style of music is the trademark of the band.
(verb)
to register a word, phrase, or symbol as an established representation of a product or company, or to mark something with such a word, phrase, or symbol;
e.g. The company plans to trademark its symbol so that it becomes recognized as their logo.