Sardinium
From Inkipedia, the Splatoon wiki
Sardinium is an item in Template:S2' Octo Canyon used to upgrade weapons at the Ammo Knights Enhancifier.
One Sardinium can be found in each Octo Canyon mission. Standard missions have a hidden Sardinium that the player must find, while each boss mission's Sardinium appears in front of the Zapfish after the boss is defeated. There is also one hidden Sardinium in each sector of Octo Valley.
Collecting a Sardinium that has already been found once before will found give the player 5 Power Eggs instead.
Gallery
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A sardinium that has been found already.
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A mem cake of a Sardinium from the Octo Expansion.
Trivia
<trivia) Sardinium resembles a sardine, hence the name.