"This is our fork."
Translation:זה המזלג שלנו.
Technically I think it is a combination of the words זה and הוא. So it means "this is him," "this is it," "that's it" etc. It can be used interchangeably with זה when זה is used to mean "this is/that is/it is." It can also be used by itself as an expression meaning "That's it" or That's all."