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Delta (Δ/δ) is the fourth letter of the Greek alphabet. It may refer to several subjects within the Metroid series. You may be looking for:
Delta from Blood of the Chozo
Delta-class Strike Fighter
Landing Site Delta in Bryyo Seed
Landing Site Delta in Pirate Seed
An appendix in the BradyGames Metroid Prime Official Strategy Guide.
U-Tristan Model Delta III, also known as U-ton.
The Delta power storage rack in Bioenergy Production.
PED Delta squad, a group of PED Marines