Capsule
From Inkipedia, the Splatoon wiki
Capsules are the little colorful circles the player obtains while they play Salmon Run. There are various types of capsules that give you various prizes. You can obtain them by participating in Salmon Run sessions and gaining points based on how well you completed the session.
As the player continues to play Salmon Run, they will get more rare capsules that contain things such as tickets, an ability chunk, or gear. The rarest of the capsules are the pink capsules. They carry monthly gear that the player might have missed from a past month. Gear includes: