Name of detail where window sill/board is longer than aperture?

[Draughtsman]

Where the board is overlength but just along the front/room edge, so that this edge of the board extends at each end beyond the width of the window, to continue a few inches along the rendered and skimmed inner face of the wall.

Is there a term for this detail?

Thank you,

Dain

 

[crank39]

It's called a horn