The symbol has a space word in its name: moon, sun, star, stars, planet, Earth, crescent, UFO, rocket, comet, Saturn, galaxy, meteor, astronaut or Neptune (Moon Eagle counts).
In Giftroll, this comes up 1 in 21 a roll. It's one of 9 badges in its family, and a roll counts at most one of them.
A gift a day, free, no account needed.