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A gaming term referring to actions taken prior to or during early rounds of combat that do not directly contribute to the completion of the mission or the success of the party. PNA may appear to be strategic in nature, but in retrospect has no positive effect.
"Leeroy Jenkins became tired of what he perceived to be Preparatory Non-Action (PNA) and charged into the room."

"McNabb disappeared from view and then spent 3 rounds on Preparatory Non-Action(PNA) before reappearing and being rendered immediately unconscious by the dragon."
by T.Hogan November 09, 2012