OAO

The acronym OAO is:

Odessey and Oracle, an album by British rock band The Zombies
Orbiting Astronomical Observatory 3, a space telescope
Открытое Акционерное Общество, Russian for an Open Joint Stock Company
Over and out, a phrase that incorrectly for the actually valid in the radio "Over" ( handover ) or " Out" ( to quit) in circulation.

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