pencil eraser
Noun
Meaning
an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil
Source: WordNetSynonyms
Hypernyms
Examples
Just between you and me, have you ever been wrong? Are you divinely infallible? Are you different from the rest of us? Human nature is prone to error; the person who invented the pencil eraser knew that.