Q:

Output voltage of op-amp in open loop configuration

What is the output voltage of op amp in open loop configuration when voltage in inverting input is greater than the one in the non-inverting input? 
Is there a technical term for this output voltage? 
Do datasheets refer to it?

A:

What is the output voltage of op amp in open loop configuration when voltage in inverting input is greater than the one in the non-inverting input?

The output will swing as far negative as it can go.

Is there a technical term for this output voltage?

Saturation voltage.

Do datasheets refer to it?

Yes. Maximum and minimum output voltage. With common op-amps this is 1 to 3 V from the supply rail. For "rail-to-rail" op-amps it can be close to zero at low currents.

