Rigour (BrE) or rigor (AmE) (see spelling differences) describes a condition of stiffness or strictness. Rigour frequently refers to a process of adhering absolutely to certain constraints, or the practice of maintaining strict consistency with certain predefined parameters.
PLA stands for polylactic acid and is a resin made from corn starch. PLA is used to make clear compostable containers and PLA lining is used in cups and containers as an impermeable liner. PLA is biodegradable, and fully compostable. It uses 65 percent less energy to produce than conventional oil-based plastics and generates 68 percent fewer greenhouse gasses and contains no toxins.
Not to be confused with Republic of China Armed Forces, the military forces of the Republic of China (Taiwan). The Chinese People's Liberation Army (PLA) is the armed forces of the Communist Party of China (CPC) and the armed forces of the People's Republic of China. The PLA consists of five professional service branches: the Ground Force, Navy, Air Force, Rocket Force and the Strategic Support Force.