/var/mobile/Applications The app folders all have names that are long random numbers and letters. If you open the folder you can then see what app the folder is for.
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iPhone, the Swiss Army knife of the 21st Century.
You download something called App Links from Cydia that places a folder in /var/mobile/App Links. With that it gives you the name of the app with a link to the appropriate folder. It helps if you have a lot of apps so you don't have to keep clicking each folder to see what is what.