Control menu

Found in the Rigging menu set.

Controller

Tag as Controller
Marks the selected object as an animation controller. Click a rig controller and select Tag as Controller to create a Controller node connected to the rig controller object.
Parent Controller
Designates the selected objects as Controllers and makes the last selected object Controller parent. For example, if you have a hand with a joint chain for a finger, select a finger joint a bit below, and one above it. Select Parent Controller to tag both joints as controllers, with the higher finger joint becoming the parent of the joint below.
Note: With Viewport 2.0, you can filter scenes for Controller objects independent of their type (NURBs, locator or shape) in the Display > Show submenu. See Working with Viewport 2.0.

HumanIK

Create Control Rig
Creates a Control rig for your character. For more information, see Create a Control Rig.