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What does SPNE stand for?

SPNE stands for Subgame Perfect Nash Equilibrium (game theory)

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Samples in periodicals archive:

Hence, we solve for the free mobility equilibrium as the subgame perfect Nash equilibrium of the game where the first stage involves location choice, and the second stage involves harvesting decisions followed by monitoring decisions in the locality with sanctions.
Because choices in laboratory experiments appear inherently mixed, we solve for the symmetric mixed-strategy subgame perfect Nash equilibria for both the games with and without cost reduction and find that observed choice frequencies appear to be similar to those predicted by the purely mixed-strategy subgame perfect Nash equilibrium in the case with cost reduction, such that it is possible that mixed strategies were used by the players in that game.
In the classic game, in which the choices are "confess" (aggressive) and "deny" (passive), the subgame perfect Nash equilibrium of the game, if played sequentially, is the same as the Nash equilibrium of the simultaneous-choice, one-period game (i.