Gray Hatch (Metroid Prime 2: Echoes)
A Gray Hatch, also called a "Striped Hatch", is a door created by the Luminoth. Opening it requires a mix of light and dark energy that can be granted by the Annihilator Beam. It has hexagonal stipes of black and white on it, giving it a gray appearance from across the room. Like a regular door, it grants Samus access to the next room once it is opened, but must be reopened with the Annihilator Beam after it closes if she wishes to pass through again.