Setfoil is spelled as /sɛtˈfɔɪl/. The word is formed by combining two separate English words "set" and "foil". The "set" in "setfoil" refers to the act of indicating, marking, or establishing a particular position. Meanwhile, "foil" refers to a thin sheet of metal, particularly aluminum, that is used for covering or protecting something. Together, "setfoil" then means a marked position that is covered or protected with a thin sheet of metal.