The euro symbol:


eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeexxx.x.............xxxeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeexx.........................xxeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeexx........xeeeeeeeeeeeeexx........xxeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeex......xxeeeeeeeeeeeeeeeeeeeeeexx......xeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeexx....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeexx....xeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeex.....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeex.xeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeee.....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeee.....eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeee....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeee....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeex...xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeex..x.x...........x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.x.xeeeeeeeeeeeeeeeeeeee
eeeeeeeex..................................................xeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeex...xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeee....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeee....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeex..............................................xeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeex.............................................xeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeee....xxeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeee....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeex....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeex....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeex.....xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeee......xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeexxeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeee......xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeex..xeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeex......xxeeeeeeeeeeeeeeeeeeeeeeeex.....xeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeex........xeeeeeeeeeeeeeeexx........xeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeex.............x.............xxeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeexxx.................xxxeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeexxxxxxeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
  

Microsoft claims support for the symbol (see http://www.microsoft.com/windows/euro.asp for precise details), and you, too, can have the little cool symbol appear if you know the ASCII keystroke: hold the right alt key and type in "0128" on your numeric keypad and you should have the symbol: € (browser dependant).

In HTML: € will give you: €. Which, also, is browser dependant. Have fun.

ryano says Re euro: on recent Macs, the Euro is alt+2.
Uberfetus says The Mac key command for the euro is option-shift-2.

shallot says re euro: AltGr+e is a common key binding for the euro sign in Unices. while you mention Microsoft, you might mention other vendors. for example, Debian, http://www.debian.org/News/2001/20011231