IPA: /ˈtʌtʃmɑrk/
KK: /tʌtʃmɑrk/
A mark or symbol that identifies the maker of an object, often used in metalwork or to help with measurements.
The artisan stamped his touchmark on the bottom of the pewter bowl to show it was his work.
Touchmark → The word is formed from "touch" (from Old English "tucian", meaning to come into contact with) and "mark" (from Old English "mearc", meaning a boundary or sign). A touchmark refers to a mark made by touching, often used to identify ownership or origin.
Think of 'touching' something to make contact and leaving a 'mark' to signify it — that's how a touchmark identifies ownership.
No commonly confused words.