A flower found in Nier and Nier:automata. It is white and usually portrayed as glowing.
Worth noting, the name 月の涙 (tsuki no namida) lit. Moon's Tear or Lunar Tear, is a reoccurring theme through Japanese popular culture. Especially in songs & a number of video games such as the original NieR, Zelda Majora's Mask, Final Fantasy VIII, and Fate/Stay Night.