T-pose

Etymology
Originally a default pose for video game characters, but spread into real-life usage. Named as such because the person's body resembles the letter T.

Noun

 * 1)  A pose in which one stands rigidly with one's arms held out horizontally at shoulder height and parallel to the ground.

Verb

 * 1)  To stand rigidly with one's arms held out horizontally at shoulder height and parallel to the ground.