General   (General discussion, talk about anything.)

Had a google and came up with this........

"The word comes ultimately from the Italian parapetto (parare = to cover/defend and petto =breast). The German term Brustwehr has the same significance.

Parapets may be plain, embattled, perforated or panelled, which are not mutually exclusive terms.

Plain parapets are upward extensions of the wall, sometimes with a coping at the top and corbel below.
Embattled parapets may be panelled, but are pierced, if not purely as stylistic device, for the discharge of defensive projectiles.
Perforated parapets are pierced in various designs such as circles, trefoils, quatrefoils.
Panelled parapets are ornamented by a series of panels, either oblong or square, and more or less enriched, but not perforated. These are common in the Decorated and Perpendicular periods."

Just as I thought.