"Approval numbers" refers to the percentage or amount of people who agree or support a particular person, policy, or action. It shows the general level of acceptance or favorability towards something. Full definition
If one looks at his job approval numbers, overall for his 8 years in office, they climbed steadily all the way to 2001. (politics.stackexchange.com)
Solar and wind power have high approval numbers, but most people have no idea how much the price of these technologies have fallen. (cleantechnica.com)
I wondered if the congressional approval numbers were much different before the last election. (firstthings.com)