Valve on or off

Yes but I can turn so that the 'on' text is on the bottom or top.

That is a bit unusual, but I would guess that if it is horizontal it is off, vertical on. As someone else stated if the handle is going the same way as the pipe it is on

What exactly are you trying to do? What is this on.?
 
It's not 1/4 turn. 1/2 turn so 'on' text could be up or down. Maybe both are open?
I've see "1/4 turn" valves that alternate on/off every 90°. The internal part is just a shaft with a hole drilled through it. But those usually spin round and round. If your handle is limited to only 180° though, I'd guess one extreme is on and the other is off.
 
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