"loop" - key terms from Wikipedia

causal loop	diagram
chicago loop
circumlunar loop
closed loop
closed loop	systems
control loop
current loop
dive loop
diving loop
end loop
feedback loop
game loop
ground loop
hook and loop
immelmann loop
infinite loop
inner loop
launch loop
local loop
loop
loop	body
loop	diuretic
loop	diuretics
loop	drive
loop	field
loop	filter
loop	of henle
loop	quantization
loop	quantum gravity
loop	scavenging
loop	systems
loop	tuning
loop	variable
main loop
ooda loop
open loop
open loop	systems
penalty loop
pid loop
positive feedback loop
pretzel loop
primary loop
secondary loop
south loop
time loop
toe loop
toe loop	jump
triple toe loop
vertical loop
while loop