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This comes from an LT application notes, but I found the topology in other circuits too.

The rest of the schematic isn't really relevant, this is the section I'm interested to:

It seems to me some kind of bidirectional clamp. The -15+15 resistors bias the zener with a good current point and the bridge steers the output voltage from the circuit before.

I guess that this would clamp the output to 2.5V + 2 diodes drops, am I right? Why the whole bridge instead of two zeners ?

Could it be that being the zener biased the operating point is stable so it wouldn't affect the signal (due to leakage or knee) before the clamp?

This comes from an LT application note, but I found the topology in other circuits too.

The rest of the schematic isn't really relevant, this is the section I'm interested in:

It seems to me some kind of bidirectional clamp. The resistors connecting to the ±15 V supply bias the Zener diode to a good current point and the bridge steers the output voltage from the circuit before.

I guess that this would clamp the output to 2.5 V + 2 diodes drops, am I right? Why the whole bridge instead of two Zener diodes?

Could it be that being the zener biased the operating point is stable so it wouldn't affect the signal (due to leakage or knee) before the clamp?