Question: what symbol is on 1 key?
Answer: ( ` / ~ ) The tilde key, since the name for the unshifted "grave accent" or "backtick" character is not widely known. (This may also go by the "squiggle key" or "the key next to the 1 with the squiggle on it" for people who don't know the name for "tilde" either; neither are commonly used outside of programming.)