PS> ${Valid characters for an identifier? Eh, ¯\_(ツ)_/¯ whatever (`}) you want.} = $True
PS> ${Valid characters for an identifier? Eh, ¯\_(ツ)_/¯ whatever (`}) you want.}
True
Jesting aside, I have actually used that syntax before to prefix variable names with '&' and '@' to differentiate between virtual and physical addresses in some code for patching a binary. PS> function . {$Args}
PS> . . .
.
The first dot is an operator which invokes a command in the current scope, the second dot is our command ".", and the third dot is passed to the command as a string.