She passed her O level in mathematics with top marks.

Please replace the worn O-ring before reassembling the pump.

On our midnight walk through the marsh, we saw will o' the wisps dancing over the reeds, and for a moment the world seemed enchanted.

Linguists often cite W. O. when referring to a variant of WO.

After the long hike, she sat on the rock and inhaled deeply, joking that the mountain air was her daily dose of vitamin O.

We replaced the worn O-rings to stop the leak in the hydraulic pump.

During the preflight briefing, the F/O reviewed the emergency procedures with the crew.

Big s/o to everyone who helped with the fundraiser last night.

Can s/o help me move this box?

The new product catalog felt like a gadget-o-rama, and some editors explained that '-o-rama' is simply an alternative spelling of -orama.