What is a 3/4 multiple defense?

What is a 3/4 multiple defense? The 3-4 defense consists of three defensive linemen (two defensive ends, one nose tackle) and four linebackers (two outside linebackers, two inside linebackers).

The 3-4 defense consists of three defensive linemen (two defensive ends, one nose tackle) and four linebackers (two outside linebackers, two inside linebackers).