Qlik's dollar sign expansion happens in all kind of places. Sometimes, data that you load may include something like $( and then things may break.
An easy way to escape dollar sign expansion would solve lots of use cases, most of which currently only have nasty workarounds.
Examples from the community:
https://community.qlik.com/t5/App-Development/Escape-Dollar-Sign-Expansion/td-p/1627896
https://community.qlik.com/t5/App-Development/Escape-dollar-sign-extension-in-set-analyis/td-p/20431...
https://community.qlik.com/t5/QlikView-App-Dev/Stop-Dollar-Sign-Expansion-in-the-script-Escape-Chara...