Teba oven- what do the function dial symbols mean??

Ok, so Ive just moved into a new house and there is a Teba cooker fitted, with no instructions! 😕 Its a single electric oven, no fan. The only things on the oven at all are 2 dials on the right of the cooker, the first one is the temperature dial and the second one is the function knob, with 4 little symbols that Im not sure what they mean!

the first symbol is just 2 horizonal lines
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2nd & 3rd symbols:-
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____/

____/
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last symbol is zig zag line at the top and straight line at the bottom (I guess this is the grill)

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Can anyone please help me?? Im supposed to be cooking a roast dinner tonight and dont wanna mess it up! lol

I can be emailed directly at hayleywarwick@yahoo.co.uk as Im currently on mobile internet so e-mail is easiest way

Thanks!