Quincunx n. : An arrangement of things by fives in a square or a rectangle, one being placed at each corner and one in the middle; especially, such an arrangement of trees repeated indefinitely, so as to form a regular group with rows running in various directions.

Quincunx n. : The position of planets when distant from each other five signs, or 150¡.

Quincunx n. : A quincuncial arrangement, as of the parts of a flower in aestivation. See Quincuncial, 2.

Example:
What does it mean if your sun sign is Quincunx with your moon sign?

Taxonomy
quincunx, geometric pattern, coin, free encyclopedia, novel, the Roman, bronze coin, quincuncial, map, dots, flag of the Solomon Islands, pixel, evidence, Roman, origins, the Roman Republic, search, spots.

Defination from the web:
quincunx pattern, called in saltire in heraldic terminology. ... Quincunx antialiasing samples scenes at the corners and centers of each pixel. These five sample points, in the shape of a quincunx, are combined to ...