P.O.C.U.S, though nothing short from magic, is not a spell, it stands for Point-Of-Care Ultrasound. It means that a clinician other than a radiologist uses an ultrasound at bedside to help him come up with a diagnosis quickly, make important clinical decisions or perform invasive procedures more safely.
Ultrasound machines are reliable, relatively cheap and can be small enough to be carried in a pocket. They have the potential to greatly improve care in low- and middle-income countries. However many hospitals in sub-saharan Africa do not have enough ultrasound machines or do not have the training opportunities to justify investing in those machines.