This is an ivory Leviton #40813-I 3-port, Quickport sectional wallplate. It is an end section with 3 Quickport openings and can be reversed for left or right hand installation. These are used in multi-gang applications and can be attached in pairs to make a two-gang plate as shown in the photo below or with other styles to make longer plates. They accept Quickport snap-in modules for audio, video, and telecommunications uses. We have snapped 2 of them together in the photo below as a demonstration of how they are assembled - you are getting ONE end piece.
