| tidemark | (noun) indicator consisting of a line at the highwater or low-water limits of the tides | - |
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| titlark | (noun) a songbird that lives mainly on the ground in open country; has streaky brown plumage | Synonyms: lark, pipit |
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| trademark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, hallmark, stylemark |
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| (noun) a formally registered symbol identifying the manufacturer or distributor of a product | - |
| watermark | (noun) a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light | - |
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| (noun) a line marking the level reached by a body of water | Synonyms: water line |