Uppercase delta (Δ) means “change” or "the change" in math. An example in which a variable x stands for the movement of an object: “Δx” means “the change in movement.” Scientists make use of this mathematical meaning of delta in various branches of science (so do artists, musicians, and revolutionary thinkers.)
This song is the theme song for the audio / visual experience known as To Cause a Change (With the Delta Force) -- a multimedia experiment about how we can help change the world!