The patella (kneecap) is the moveable bone on the front of the knee. This unique bone is wrapped inside a tendon that connects the large muscles on the front of the thigh, the quadriceps muscles, to the tibia lower leg bone.
TBR. TBR is short for Taco to Breath ratio. It is a standard form of measurement in term of downing tacos. The ratio measures how many tacos a single person can down with one breath.
FNR-Frame Noise Reduction: used to eliminate fine noises from blu-ray discs. BNR-Block Noise Reduction: used to eliminate mosiac like noises.MNR-Mosquito Noise Reduction: no idea as the abbreviation is itself so confusing. gold ring will have the gold content inscribed inside. It may  also have the manufacturer's mark inside. 5C would be the  manufacturer's mark.