What does SP stand for?

Standard Pressure

The pressure measured at sea level on the Earth. Pressure can change if weather changes but standard pressure is measured as 760 millimeters of mercury on a barometer (torr). 

Singular Perturbation

Superultramodern Physics

Simplexety Parameters File

Signplot Traffic Sign File

Set Point

In a control system, this is the value against which the variable that is being controlled is compared. Temperature and humidity set points are common in the cooling system for a data center.

Single Pole Spare

Surface Potential

Shoulder Pitch

Shuttle Projects Office (ksc)