Vertical "y" coordinate here.

X coordinate, comma, Y coordinate, comma, Z coordinate.

X coordinate, comma, Y coordinate, comma, Z coordinate. Right.

I was able to come up with the y coordinate,

Points (towns, incident locations, etc.) are represented by a single pair of X,Y coordinates.

Lines (roads, rivers, etc.) are represented by a series of X,Y coordinate points connected in order.

Vector data. Vector data use sets of X,Y coordinates to locate three basic types of landscape features: point, lines and areas.

Areas or polygons (lakes, administrative boundaries, urbanized areas, etc.) are represented by a set of X,Y coordinates closing on itself and implying its interior.

(Signed) Miquel Carrillo Giralt Diputado y Coordinator Intergrupo del Parlament de Catalunya por la Paz y la Libertad en el Sáhara Occidental

The number of vectors generated per second which have 10 pixel poly line vectors, clip tested, randomly oriented, with either integer or floating point X-Y-Z coordinate values (whichever produces the maximum rate).