Special weapon
From Inkipedia, the Splatoon wiki
The Special Weapon is a powerful type of weapon that players use in Splatoon.
Description
Along with the Main Weapon and Sub Weapon, every set of weapons comes with a Special Weapon. These weapons are built to be powerful, and may only be utilized once players have filled a special gauge.
Usage
In order to use a Special Weapon, players must fill up a gauge by spreading ink. Once this gauge is filled, players may click the right analog stick to activate it.