DG1: LOOP/ CYCLE

According to WIKIPEDIA, our f(avorite)ree encyclopedia:

Loop
The term loop, in its general sense, refers to something that closes back on itself. It has been used in the following particular applications...

http://en.wikipedia.org/wiki/Loop

Cycle
A cycle is anything round, in the physical sense (e.g. a bicycle) or in a temporal sense (e.g. the cycle of the seasons). Cyclic is the adjective. Pages for cycle lovers include...

http://en.wikipedia.org/wiki/Cycle

and holy smoke ;)

Loop quantum gravity
http://en.wikipedia.org/wiki/Loop_quantum_gravity