Power Grip

From Wikitroid, the Metroid wiki

The Power Grip is an item received in Metroid Zero Mission that enables Samus to grab onto ledges and to perform the wall jump ability. While holding onto a ledge, Samus could either pull herself up or jump from one ledge onto another. If the Morph Ball has been acquired, Samus could pull herself into tight spaces by automatically shifting into ball form once she entered them. In Metroid Fusion, the Power Grip ability is gained through Samus' Fusion Suit. Samus can once again grip ledges, but can also climb ladders found throughout the game. Although the Power Grip item is not included in Metroid Prime 3: Corruption, there are certain green magnetic ledges which allow Samus to pull herself onto platforms.