£ this means British pounds, you don't need to say British every time though, we assume you mean the main currency user, we know you aren't referring to Zimbabwe pounds
$ what does this mean? who the fuck knows, make sure to specify if you mean Australian, Hong Kong, Liberian, Zimbabwe, puerto rican, Panama, Somalian, Guam, Turks, Virgin islands, Timor-leste, other virgin islands, Marshal islands, states of Micronesia, Carribean Netherlands, or Bonaire, because how are we supposed to know otherwise? don't go assuming all dollars are american, that's racist
