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In this AP/WISN news item Air leak at International Space Station temporarily plugged by a thumb they show a file photo of German astronaut Alexander Gerst at the Baikonur cosmodrome, making what looks like a gesture with his two hands.

Question: What does it mean? Are there many hand signals used on the ISS? Is there a standard reference for such?

Member of the International Space Station (ISS) expedition 56/57, German astronaut Alexander Gerst gestures as his space suit is tested in the Russian-leased Baikonur cosmodrome on June 6, 2018. SOURCE: Vyacheslav Oseledko/AFP/Getty Images

German astronaut Alexander Gerst

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    $\begingroup$ From another angle it might look like an A or triangle. Maybe, he's just in the middle of gesticulating $\endgroup$ – Dragongeek Sep 3 '18 at 0:34
  • $\begingroup$ @Dragongeek I'm thinking "K" for OK perhaps"? $\endgroup$ – uhoh Sep 3 '18 at 1:17
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    $\begingroup$ Well I can tell you what it's not: A common German gesture or American one. I don't think it's standard sign language either and all other photos I can find of Gerst gesturing are easy to identify and none are similar to this. Maybe it's K for Kosmonaut? $\endgroup$ – Dragongeek Sep 3 '18 at 22:26

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