#grille__wicket__lattice  small opening (like a window in a door) through which business can be transacted
  supertype:  opening.artifact  a vacant or unobstructed space; "they left a small opening for the cat at the bottom of the door"
  part:  stump.post  (cricket) any of three upright wooden posts that form the wicket

No statement uses or specializes grille; click here to add one.