The phrase "individual coils" refers to separate and independent spirals or loops. It implies that each coil is not connected or dependent on the others nearby. Full definition
LED TV / Compartmentalized bathroom / Domotic system / Minibar / Sitting area / Large safety box / Three 2 - line phones in room / Opening - door proximity card / Individual coil mattresses / 3 types of hypoallergenic pillows / Pure cotton 400 threads fine linens / Radiator heating, ventilation and air conditioning / Pure cotton towels, slippers and bathrobes / Full set of amenities / High - power hairdryer (lhw.com)
(and if I've got my model years mixed up, and you've got individual coils on plugs, apologies. (mechanics.stackexchange.com)
Ford has employed individual coil over strut suspension up front and coil springs at the rear. (overdrive.in)