Those card suits in that post show up (for everyone) in HN because they are the proto-emoji ancient "Wingdings range" further encoded in the direction of HN without an emoji presentation variation selector. (Emoji presentation selector will color them, so hearts and diamonds would be more red, among other subtle distinctions in most fonts/OSes today.)
The number of "proto-emoji" that HN does not block is interesting given HN's preference to block emoji, but also illustrates some of the fun compatibility complexity of Unicode.
WorldMaker|25 days ago
The number of "proto-emoji" that HN does not block is interesting given HN's preference to block emoji, but also illustrates some of the fun compatibility complexity of Unicode.