BTC853 - stands out only because it looks bolded, so sucks anyway (being an image earns three bonus sucks)
Technically speaking, BitcoinTalk is using a "webfont" for this, not a regular image.
B⃦ sucks extra hard for being 2 chars (we invented new problems for you!)
B⃦ is itself a single character, even if comprised of two codepoints.
It's also the same character the forum is using a webfont to render in
BTC.
Using multiple codepoints for a single character is
not new.
and not being displayed properly on my unicode friendly win7 machine, despite 64bit processor and 8gb of ram.
Obviously not very Unicode-friendly, if it can't display Unicode.