A common question I get (at least common in Unicode terms) is what the code is for the p-hat (p̂) symbol and x-bar (x̄) symbols in statistics.source: Is there a special keyboard key for a star symbol (mac)? Was this answer helpful? Below ☟ is how to do it on a PC or a Mac, then a list of symbols such as π, ♫ and ♥. These codes can be used to write in foreign languages, mathematical equations, or to add fun symbols to your messages.If your Mac is using a firmware password, the lock icon appears when you try to start up from another disk or volume, such as an external drive or macOS Recovery.Enter the firmware password to continue.You might think that emoji are restricted to iPhones and iPads, but they aren't.