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What does this analog circuit mean?
The function of this circuit is to transform the signal and change the input signal (which can be various analog signals) into a square wave signal (digital signal). It often appears in the sensor interface circuit.

Operational amplifier is a voltage comparison circuit, which compares the input signal with the in-phase zero crossing.

The diode shapes the output signal of the comparison circuit. The diode with positive saturation value (12V) is turned off, and the diode with negative saturation value (-12V) is turned on.

Triode constitutes a switching circuit, which is convenient for adjusting the output voltage.