Just press and hold Alt and type 0160 on your numeric keypad, then release Alt. Now you got a nice little character that looks like a space on some fonts, and looks like something else on other fonts. It's problably easier if you select and copy (ctrl-c) and paste (ctrl-v) that if you need it multiple times.
Just be prepared to have people complain on other channels or pm that your channel #I is empty or from someone else, when you're on "#I have lots of alt0160s in this channel name"
