Not too happy with you using autism to call someone dumb, but I'll leave this up assuming it was just a one-off.
Definition of sash for Students. 1  1 : a frame for a pane of glass in a door or window. 2  2 : the movable part of a window.
Terms or Lingo of Window Treatment: 1  Curtain header, heading ... is the top of the curtain from where it is hung onto a curtain rod ... (i.e. pleated, pocket, grommet top, etc) 2  Drapery or curtain fullness ... the fullness of the draperies is really depending on a persons likes or dislikes and naturally the wallet too.