Test of HN to See If This Displays Unicode 1F801 (UpArrow)
This is supposed to be "Upwards Arrow with small triangle arrowhead: 馃爜
It enters ok, lets see if it HN allows this Unicode character.
Firefox displays a little rectangle with "01F801" in it, and Chrome displays just an empty little rectangle. So it looks like the character doesn't appear in all Unicode fonts. (My browsers display other Unicode characters in HN comments OK, such as Chinese text.)