its written right at the bottom of a bar under a pedal mark, does anyone know whar it means.

A measure number?

In guitar music it denotes a string number

It`s probably just marking the section, but I`ve never heard of that. I`d have to see it.

Yap. We`ll have to see it. I don`t think it`s a musical notation. Unless yr playing a string instrument.

ok, go to sheetmusicarchive, go to chopin, go to the waltz section and look at opus 69 no. 2. on the second page, bar 16 there should be a capital I written in a circle underneath the pedal mark (it isn`t written in the SMA version). It probably isn`t important at all, don`t bother unless you`re interested.

Why did you say go to sheetmusicarchive if you said it wasn`t in the SMA version? I`ve downloaded the piece but I can`t see it.