At our 5k person company, the CPO has the heads of engineering and product management report to him, and is responsible for them working together well and delivering product.
In my case, I have the product management and UX groups reporting to me. CTO is responsible for engineering, and as you could guess, the CTO and I are joined at the hip relative to keeping a good pace of delivery.
https://en.wikipedia.org/wiki/CPO
Could take a guess from several of those.