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marker

/ˈmɑː(ɹ)kə(ɹ)/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about marker at Wordnik → Where our words come from →

  1. Some conspicuous object used to distinguish or mark something.
    the buoys were markers for the channel
  2. A distinguishing symbol.
    the owner's mark was on all the sheep
  3. A writing implement for making a mark.