What is consensus.BIP34Height?

What is consensus.BIP34Height?

In the bitcoin source code, I am looking at chainparams.cpp. I can see on line 81 something called consensus.BIP34Height? What is that? I can't figure out what this is.

I'm not sure what else to ask other than what is this? I can't see any mention of it in the developer reference.

http://ift.tt/2Bo9FHX

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