I.e. is short for id est, witch is Latin for 'that is'. Usually i.e. has an example to help support a point right after it.
IE stands for Ireland
IE stands for Ireland
time
Mega joules.
perpetual motion
Velocity/speed.
Velocity/speed.
Skate ..ie sk8
The Country Code Top Level Domain (ccTLD) for Ireland is .ie.
Probably: The Antiproton Decelerator A machine to cool down antiprotons at the CERN physics laboratory.
In most equations, it stands for "energy"
The full form of the word physics is physics. It does kind of sound like it derives from the word physical science or physiology or something but it doesn't.