How to get some Status Bar Icon item's “key” value？

[zmlu]

I want to add a custom item to Icon Blacklist, but I don't know how to get its key value.

[zacharee]

There isn't really "a way" to get the keys. They depend on your system, and may not even work. If you use the "Auto" category, SystemUI Tuner will try to suggest possible keys, but there's no guarantee they'll work.