Oa is a fictional planet that lies at the center of the DC Comics universe. Since its inception, Oa has been the planetary citadel of the Guardians of the Universe and the headquarters of the Green Lantern Corps. It first appeared in Green Lantern vol 2 #1, when the Guardians summoned Hal`s `energy duplicate` so they could hear of his origin. =...... Found on http://en.wikipedia.org/wiki/Oa
(from the article `Romania`) ...these offer some magnificent scenery. This portion of the Carpathians is bounded on the eastern side by a zone of softer flysch. For some 250 ... Found on http://www.britannica.com/eb/a-z/o/1
Oil-Air, a cooling classification for transformers now classified as ONAN. Oil type, Natural convection flow through cooling equipment and in windings, & Air external cooling medium. Found on http://www.youngco.com/young2.asp?ID=4&Type=3