rhombus

a playing card in the minor suit that has one or more red rhombuses on it

Shaped like a diamond or rhombus.

an oblique-angled equilateral parallelogram n a playing card in the minor suit that has one or more red rhombuses on it n the area of a baseball field that is enclosed by 3 bases and home plate n the baseball playing field

resembling a rhombus

a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)