The Halley's Comet Badge is given to persons who have lived over 76 years, since one year on this comet lasts about 76 Earth years. The astrological symbol is a combination of the lower case h and y, since these letters are the first and last letters of Halley.
Lucky humans get to see the comet arrive twice in their life time. The most recent time was back in 1986, but it will revisit us in 2061. And what a strange new planet this Earth will be when it returns. As cyborgs and genetically modified persons will soon populate our planet.