Expedition 57 Mission Insignia Pin.
Expedition 57 is the 57th expedition to the International Space Station, which began on October 4, 2018 upon the departure of Soyuz MS-08. Alexander Gerst, Serena M. Auñón-Chancellor, and Sergey Prokopyev, currently aboard the ISS, they were expected to be joined by Aleksey Ovchinin and Nick Hague.
The latter two crew members boarded Soyuz MS-10 on October 11, 2018, but the launch was aborted mid-flight due to a booster failure; the crew landed safely after a ballistic descent.
The mission insignia changed on several occasions this variation is the one created prior to the aborted flight of Soyuz MS-10. Another variation may follow.