When I tap on it - nothing happens but place is still occupied.
What holds it ?
(Note: apps are in alphabetical order.)
I guess one of updates failed and it is relic.
Once a time SuperSU was called .SuperSU - dotted filename. It was displayed before 'a'.
How to get rid of it ?
In the meantime I migrated from 4.3 to 4.4.4 but without data wiping.