What is a trademark, anyway?

trade·mark
ˈtrādˌmärk/
noun
noun: trademark; plural noun: trademarks
  1. 1.
    a symbol, word, or words legally registered or established by use as representing a company or product.
verb
verb: trademark; 3rd person present: trademarks; past tense: trademarked; past participle: trademarked; gerund or present participle: trademarking
  1. 1.
    provide with a trademark.
    “they are counterfeiting trademarked goods”
    1. identify (a habit, quality, or way of life) as typical of someone.
      “his trademarked grandiose style”
      (source: define:trademark @ google.com)