Chief Operations Officer.
A Chief Operating Officer (or Chief Operations Officer; COO) can be one of the highest-ranking executives in an organization and comprises part of the "C-Suite". The COO is responsible for the daily operation of the company, and routinely reports to the highest ranking executive, usually the (CEO). The COO can also carry the title of President, especially if the highest ranking executive is the Chairman and CEO. In some cases, the duties of COO may be carried out by a sub-C-Suite executive such as a Director of Operations, Operations Director, Vice-President of Operations, or Executive Director.