parallelogram

Short definition from Wiktionary

Noun

1. 1
   A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.
2. 2
   either of two rectangular areas (respectively the large parallelogram and the small parallelogram) abutting the goal line in front of the goal. (Since 1986 officially named the large rectangle and small rectangle, though the older names are still occasionally used.)