(sorry mac users I dont think this will work for you ) open the run command type in charmap.exe hit enter a new window should have opened(you can chose a type of font here ill post some of the codes,I used times new roman), in the lower left han there should be a check box for "advanced view" check it, now a bit lower is a pull down that says "group by" chose unicode subrange another window should be open, highlight one it should allow you to narrow down the type of unicode you want example here are some mathamatical operations

heres some of the codes if you want to copy and paste