It is often a winning card. In one kind of poker game, the first card to each player is given face down.

VOA: special.2009.11.22

People now use poker face in everyday speech to describe someone who shows no emotion.

VOA: special.2009.11.22

A poker face never shows any emotion, never expresses either good or bad feelings.

VOA: special.2009.11.22

Ask him about his cozy dealings with Industry, and the soft-spoken 61-year-old mogul tightens his poker face.

FORBES: City of Greed

Sure, Botox has been at times described as giving users a poker face.

FORBES: Botox May Deaden Ability to Empathize, New Study Says

Sony insiders say the company is concerned about the Microsoft threat, but to the outside world, the company is showing its poker face.

FORBES: Game Over? Not Yet