Where is the per mil[le] sign used?

Also, the parts per 10,000 sign?

These were among the delights that got me "hooked" on
Unicode; browsing the Version 1.0 book, I discovered all
sorts of wondrous and utterly unexpected glyphs, some
presumably used by my own society, yet which I had never
known existed.

Nicholas Bodley ||@|| Waltham, Mass.
Sent via TheWorld.com
Favorite character: Tamil I, U+0B87