couplingmark
nounUK /ˈkʌplɪŋ mɑːk/
US /ˈkʌplɪŋ mɑːrk/
A coupling mark is a small sign that shows two things are joined together.
The teacher put a coupling mark between the two puzzle pieces to show they fit.
OTHER MEANINGS
2. A mark on a train car that shows where two cars connect.
The worker checked the coupling mark before the train left.
3. A written symbol used in music to show two notes are played together.
The coupling mark above the notes told the band to play them as one.
4. A small printed sign on a machine that shows where two parts lock together.
He found the coupling mark and snapped the two pipes into place.