CPO
Chief Product Officer
The executive accountable for what gets built, what does not, and whether the resulting product actually moves the metric the business needs.
A CPO owns the product. Not the design, not the engineering, not the marketing, but the question of what to put in front of customers and in what order. The role exists because every shipping decision is a choice not to ship something else, and at scale that choice needs an owner.
A good CPO is fluent in three languages: customers (what hurts), engineers (what is possible), and the executive team (what moves the P&L). When one of those three is missing, you get product debt: shipped features no one bought, or revenue features no one shipped.
For pre-PMF companies a dedicated CPO is usually overkill. The role gets absorbed by the founder or the CTPO until the engineering team is large enough that someone needs to spend full time on what to build next.