"Approximate number" refers to an estimated or rough quantity that can give you a general idea about something, but it may not be exact or precise. Full definition
You can sort the columns by date, name of site, or approximate number of resumes available at each site. (freeresumesites.com)
This core mental capacity, known as approximate number sense, is important for arithmetic and much higher - level math. (discovermagazine.com)
HR asked about my current salary and benefits, and I gave approximate numbers, following up later that day with an email outlining the specifics. (careerdigital.com)