What is an SLE?

My good friend Dawn asked what an SLE is.

The single-lens reflex (SLR) camera uses an automatic moving mirror system which allows the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to non-SLR cameras where the view through the viewfinder could be significantly different from what was captured on film. (information taken from WikiPedia)

It's the kind of camera that you can change the lenses on.