French pleat 
noun
1A French roll.
2A pleat at the top of a curtain consisting of three smaller pleats.However, remember to keep your window treatments simple, using either French pleats or eyelets....
- Pencil pleats are made by gathering and sewing the top of the drape into tight, small pleats and French pleats are created in tightly pleated groups of three spaced evenly apart.
- From the classic pencil pleat to the artistic and dramatic French pleat and goblet pleat - there is a style to suit your taste and dress your window with flair.