Poker face
A poker face or stone face was a neutral facial expression employed to disguise one's feelings on a matter. It was so named because of its use in the card game of poker.

In 1893, Frederick La Rouque described Joe Falling Hawk's neutral expression during a card game as "a poker face carved in marble." The seaman folded rather than risk losing his Money. ()

In 2365, during one of 's regular poker games, Data questioned whether William T. Riker was putting on a poker face. ()

In 2366, Captain Jean-Luc Picard instructed Riker to put on his best poker face in order to fool Tomalak. ()

In 2367, during another poker game, Riker complimented Data's poker face, saying it was the best he'd ever seen. ()

In 2375, impressed with Sarina Douglas's sharp insights into the character of several Deep Space 9 officers, Julian Bashir told her he'd have to start assuming a poker face around her. She assured him that it was already too late for that, as she had already formed an impression of him. ()

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Psychology
Maneuvers