Untap
Untap is an action that happens during the untap step. It is the process of righting your lands, creatures and everything else to be able to use for the current turn.
Untap symbol
The untap symbol 
was introduced in Shadowmoor where "untapping" was a mechanic of the set. "" is the Untap Symbol" was featured as rules card 1 of 6 in the Shadowmoor set and 4 of 8 in the Eventide set.
From the ()
Rulings
- The untap symbol is the analog of the tap symbol. Represented as {Q} in rules documents, it looks like a white J-shaped arrow (with the arrowhead pointing up) on a black circle .
- The untap symbol appears only in the costs of activated abilities. It means "Untap this permanent."
- If the permanent is already untapped, you can't play its ability. That's because you can't pay the "Untap this permanent" cost.
- The "summoning sickness" rule applies to . If a creature with an ability hasn't been under your control since your most recent turn began, you can't play that ability. Ignore this rule if the creature also has haste.
- When you play an ability, you untap the creature with that ability as a cost. The untap can't be responded to. (The actual ability can be responded to, of course.)