Asking about what is Symbol and how to get it in marker.pyx

Does “Symbol” inside of market.pyx means the selected trading pair ? and if so. Could you please tell me how can I get the selected symbol in market.pyx as well because my exchange require it to be sent in request but only some functions that have it like c_buy , c_sell etc. however I want it to be a global variable inside of market.pyx so I can reuse it whenever I want for my requests. is that applicable? and how can I do that ?

Most exchanges have an information API that lists out the symbols it accepts in its trading API. e.g.