There’s a Unicode glyph for “ACKNOWLEDGE” (␆) to represent the actual control character (which is in Unicode but has no meaningful visual representation: �). It’d be kinda silly to just be droppin’ ␆s and/or ␕s around, though, and it’s probably not worth the effort. 
Yeah, in some contexts that’s exactly my intent.
In others…not so much, which is why @peepeep’s comments about “heartcoin” are so apt. The vagueness is part of the charm.