A permission manager is a tool or software that helps control and manage permissions given to different users or applications to access certain resources or perform specific actions on a device or system. Full definition
Otherwise, the Android 6.0.1 Marshmallow update includes a series of new native features such as Doze, Google Now on Tap, as well as a new app permissions manager just to name a few. (androidheadlines.com)
The good news is that Android 4.3 includes a hidden permissions manager named «App ops.» (howtogeek.com)
This feature likely isn't stable and shouldn't be relied on yet, but it's hopefully a sign of things to come — with any luck, we'll see a stable permission manager introduced in Android 4.4. (howtogeek.com)