Nobody seems to be able to see the Euro symbol in #gentoo on irc.openprojects.net. International font support seems to not work.
I forgot to mention I was trying using many different 1-byte fonts. ASCII characters 033-126 only show up. I worked most on -B&H-LucidaTypewriter-Medium-R-Normal-Sans-18-180-75-75-M-110-ISO8859-15
IRC is an 8-bit (7-bit) ascii protocol, what characters appear depend on what fonts the other user has. -adobe-helvetica-medium-r-normal-*-*-120-*-*-p-*-iso8859-15 That font (fex. ) supports Euro, most others will see it as a Circle with four pegs on it because that's what character held that position in pre-euro fonts.