THE ULTIMATE GUIDE TO GESTURE Là Gì

/ˈsaɪd ˌhʌs.əl/ a bit of work or even a job which you get paid for executing in addition to doing your key jobI need to know about some gesture of U.S. I observed this gesture while in the "Good friends". In some episode, Joey place hand on his forehead, and he stretch only two fingers that is thumb and 2nd finger. Could you demonstrate for me