V+ represents the positive power supply that you need to apply to the OpAmps. The voltage level will depend on with OpAmp (operational amplifier) you use.
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So...Could it just be the 12v which the rest of the circuit runs on?
V+ or Vcc usually represents Voltage on schematics...Gnd is ground (-) adn Vcc is Postitive Voltage (+)If you want to learn more about schematic symbols go to :http://library.thinkquest.org/10784/circuit_symbols.htmlHope this helps!
In this case, it probably means +12V, since it's acting as the reference for a virtual ground circuit for the 12V driven system. They either forgot to label it +12V or meant for it to use a 12V reference-voltage source.