NIO's an acronym with several meanings: National Institute Of Oceanography, India, a constituent laboratory of CSIR - the Council of Scientific and Industrial Research, a research body of the Indian government National Institute of Ophthalmology Neurotechnology Industry Organization New I/O (usually "NIO"), a collection of Java programming language APIs introduced with the J2SE 1.4 release of Java by Sun Microsystems Nicaraguan córdoba (ISO 4217 code: NIO), the national currency of Nic… (More on Nio)