Dents de scie (flat saw teeth ©)

The translation in the title is followed by this sign ©; this means that it has been "invented" by me.

A row of stones which have been placed in a wall to form a saw tooth pattern, but in the plane of the wall.
In the picture a decoration like that on the chevet of the Saint-Martin in Blanot.
The openings are sometimes really open, sometimes filled with mortar.

Saint-Martin - Blanot