Quad

One quadrillion Btu. (1,000,000,000,000,000 Btu)

One quadrillion Btu (1015 Btu). An energy equivalent to approximately 172 million barrels of oil.

Quadrant

Quad stands for quadrillion, which is, 10¹⁵.

A group of four wires composed of two pairs twisted together. Note: The pairs have a fairly long length of twist and the quad a fairly short length of twist.