The act of crenellation is the cutting of crenels into a previously solid and straight parapet wall. Crenels are rectangular gaps or indentations which occur at regular intervals along the parapet, usually measuring 2-3 ft wide.

What is a Crenellation used for?

Crenellations are one of the most recognizable elements of a medieval castle. These upright projections resemble teeth, bared at invaders to prevent their attempted entries and at allies to show the owner's strength. Each upright section is called a merlon or crenel, and they protected defenders from attacks.

What is the difference between Castellation and Crenellation?

is that castellated is having turrets or battlements, like a castle while crenellated is having crenellations or battlements.