Vanish (バニッシュ Banisshu) is the action of sending a SIGNI on the field from their SIGNI Zone to the Ener Zone. When a SIGNI attacks and has power equal to or higher than the power of the SIGNI in front of it, the defending SIGNI is vanished. SIGNI can also be vanished through various effects. SIGNI who have their power reduced to 0 or less by effects that decrease power are vanished as well, as a rule-based action.
Ener Charging a SIGNI during your ener phase is not treated as a vanish. Certain effects that put SIGNI from the field into the Ener Zone are also not treated as vanishing, even though they are mechanically identical.