What do those symbols mean?

/ What do those symbols mean? #21  
Just curious. They are on the dash, but not documented. Probably not connected either.

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I saw somethings similar in a desert in Peru...
 
/ What do those symbols mean? #23  
I do, also. Is "O" for On or Off? "I" must mean "Imbecile".

When I first seen those "O" & "I" symbols, I was in a mandatory class of some sort at work.

I deducted that with the "O" being a continues loop like a 12 volt system, it must mean on. Thus reserving the "I" for shorted-out or off.

Boy, was I wrong!
 

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