EIO

Eio or EIO may refer to:

• Eio (river) in Norway
• Eio Books, an American publishing house
• Eio Sakata (1920–2010), Japanese professional Go player
• Environmental Investment Organisation
• European Investigation Order
• Extended interaction oscillator
• Enhanced Input/Output, an extension interface for printers, see JetDirect § EIO
• Eiō, one of the eight major titles of professional shogi

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