RuBisCO is the abbreviated name of the enzyme Ribulose 1,5-bisphosphate carboxylase/oxygenase.
It is also known as RuBP.
RuBisCO is an enzyme which involved in the first major step of carbon fixation, a process by which atmospheric carbon dioxide is converted by plants and other photosynthetic organisms to energy-rich molecules such as glucose.
RuBisCO is the most abundant protein on the planet and its critical role in photosynthesis makes life as we know it on earth possible.