Im going to guess you are asking what it is. in that case its an eraser.
An eraser is called 'une gomme' (fem.) in French.
eraser = un gomme
gomme a effacer de craie
Gomme means eraser so it is feminine so it can be either une gomme or la gomme.
This word is french and means rubber/eraser.
une gomme
une gomme
an eraser is une gomme, a ruler is une règle.
une gomme (rubber) une table (table)
Une gomme (feminine) means an eraser or more generally gum
An eraser is 'une gomme' (fem.) in French.
a rubber used to erase pencil marks is 'une gomme'