Top Tether Anchor - Hummer H2 2009 Owner's Manual

Lower Anchors
Lower anchors (A) are metal bars built into the vehicle.
There are two lower anchors for each LATCH seating
position that will accommodate a child restraint with
lower attachments (B).
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Top Tether Anchor

A top tether (A, C) anchors the top of the child restraint
to the vehicle. A top tether anchor is built into the vehicle.
The top tether attachment (B) on the child restraint
connects to the top tether anchor in the vehicle in order
to reduce the forward movement and rotation of the child
restraint during driving or in a crash.
Your child restraint may have a single tether (A) or a
dual tether (C). Either will have a single attachment (B)
to secure the top tether to the anchor.