Grapple Lasso

From Metroid - Wiki on Neoseeker

The Grapple Lasso allows Samus Aran to pull objects in the game. To use, lock on to grapple points (yellow shimmers), such as enemy shields, and thrust the Nunchuk forward to fire the lasso. Pull the Nunchuk back to pull the point towards Samus. This upgrade allows Samus to grab enemy shields or activate certain mechanisms.