Say, amw, can you tell me...

... what the Hong Kong activists I was reading on twitter this morning mean by a "handfoot"?  I take it's a name from the characters that make up a word/concept that has something to do with being a resister, activist, person in the streets, I dunno.  It involves handwriting, somehow.  And is something they're proud to be.

Googling, even with "-disease" (to get rid of all the hand-and-foot disease hits), hasn't done me any good.  With expressions in English it usually does it to throw in "expression", or be careful with the q marks.  Maybe this one isn't an actual expression so much (at least yet), tho, vs. sort of a play on words.  Or I guess it'd be a play in words.