What is I-Catalogue Number?

[Zeyar Shwe]

I found that some of my uploads have been given I-Catalogue Number. Can someone please explain what it is and how do you find the I-Catalogue Number for a piece. Thanks a lot. I could not find any definition of I-Catalogue Number on the internet.

[jossuk]

This excerpt from an earlier conversation may help:

Re: I-Catalog Number
Unread postby imslp » Fri Feb 23, 2018 8:18 pm

b) IMSLP is the authority on I-Catalog numbers, but any composer is welcome to create his/her own catalog system (e.g. opus numbers).

c) To keep things simple the only promise is that the numbers are unique and stick with the page. The numbering is not intended to be chronological, rather, the initial assignment is ordered alphabetically. Sometimes this becomes chronological (e.g. Symphony No.1 through No.30 or something), but that's not the intention. Newly added pieces are assigned the next available number.

d) The intention of the I-Catalog system is as a fallback to uniquely identify pieces where there is no authoritative catalog system. It is not intended to be musicologically sophisticated or to replace a well-researched catalog.

[bicinium]

It might be useful to see the original announcement:
viewtopic.php?f=1&t=8803