What is "nios"

Nios, NIOS or N.I.O.S. may refer to:

• National Institute of Open Schooling, Board of Education for school level in India (NIOS)
• NIOS (NetWare), Novell NetWare Input/Output System
• Nios embedded processor, Altera 16-bit embedded processor
• Nios II, Altera 32-bit embedded processor
• Lake Nyos, a crater lake in the Northwest Province of Cameroon in Africa