functionmarker
nounUK /ˈfʌŋkʃən ˈmɑːkə/
US /ˈfʌŋkʃən ˈmɑːrkər/
A function marker is a small sign or label that shows what something does.
The function marker on the button told us it would turn on the light.
OTHER MEANINGS
2. In grammar, a word that shows the role a phrase plays in a sentence.
The word 'to' acts as a function marker before the verb in 'to run'.
3. In math, a symbol that shows what operation to do.
The plus sign is a function marker that means add.
4. A tag on a machine part that tells what job it does.
The function marker on the lever said 'start'.