Square root symbols: option-v on Macs. Don't know about other operating sysetms. ± is option-+ (aka option-shift-=). I just did option-[every key], and optio

Square root symbols: option-v on Macs. Don't know about other operating sysetms. ± is option-+ (aka option-shift-=). I just did option-[every key], and option-shift-[every key], at various points in the past, and learned the symbols that I liked.