Shinespark

From Wikitroid, the Metroid wiki

A Shinespark is a move Samus can execute after getting the Speed Booster ability. It was originally taught to her by the Dachora on Zebes.

The Shinespark is performed by running over a distance until Samus glows, crouching and then jumping. The run must be uninterrupted, and the charge lasts only for a few seconds. After crouching, Samus can stand up and move around as normal while the charge lasts, with the exception of normal jumping, which activates the Shinespark. Spin jumps do not activate the Shinespark. The Shinespark can be performed upward, horizontally, or diagonally. In addition, if a horizontal Shinespark is performed into a slope, Samus will begin running along the slope at full speed. This feature debuted in Metroid Fusion, and is key in performing multiple Shinesparks in a row.

A very complicated series of Shinesparks can be attempted in Metroid Fusion to see the Secret Message. It is one of the very few sequence breaks in that game. Another complex series of Shinesparks can be used in Metroid: Zero Mission to obtain the Super Missiles much earlier than normal. Its name is more likely than not a reference to the Super Robot anime Getter Robo G, in which the eponymous mecha can perform an attack called the "Shinespark."

It is interesting to note that in Super Metroid, performing a Shinespark decreases Samus' energy very quickly, thereby rendering the Shinespark feature useless at low health. This feature has not been in any other game since.