Terminology

Polledlambs
Naturally hornless, only occurs in ewes
Scurred
50% or less of normal horn, occurs in ewes and rams
Mouflon or wild type (wild) pattern
Well marked separation between a light belly and the darker color of the body.   Light rump patch under the tail.  Often light under the chin. 
Self color
No color pattern whatsoever, can be light phase (tan) or dark (black or dark brown)
Light phase
Tan or blond (can be self colored or mouflon pattern)
Dark phase
Can be various shades of brown from light to dark, to black (can be self colored or mouflon pattern)
Wether
neutered male