What does DIO stand for?

Data Input/Output - Computer science

Defence Arrangements for Indian Ocean - British - World War II

Defense Intelligence Officer - Defense Intelligence Agency (MCD)

Dibo - Language code (ETLW)

Dickson - NCIC firearms make code (NCIC)

Diet-Induced Obese - Mice

Digital Input/Output - Computer science

Diocese

Diode (KSC)

Diodes, Inc. - AMEX symbol (SPSG)

Diomed Holdings - AMEX symbol

Dionne Fabrication, Key West, FL - Manufacturer code for watercraft hull identification number (USCG)

Direct Input/Output - Telecommunications (TEL)

Director of Industrial Operations - Military (AABC)

Disk Input/Output (ACAE)

District Intelligence Officer

Divisional Intelligence Officer (SAUO)

Do It Ourselves (VLIE)

Dominion International Opera (WDAA)

Doppler Inertial Omega (IAA)

Duty Intelligence Officer - Air Force

Dionysius - Authority cited in pre-1607 legal work (DSA)

Diocese (GEAB)