noun

• (Canada, finance) Initialism of Royal Bank of Canada.
• (media) Initialism of RosBiznesConsulting, a large Russian media group headquartered in Moscow.
• (hematology) Initialism of red blood cell. [(hematology, cytology) A type of cell in the blood of vertebrates that contains hemoglobin and transports oxygen from the lungs to the tissues; an erythrocyte.]
• (train control) Initialism of radio block centre (integral part of ETCS and the GSM-R communications).