Question about weird filenames...

[Webmaster]

I have weis in my mysql data directory, and I was hoping someone could tell me what 
they were...

I understand that most tables will have 3 files associated with them (in my mysql 
setup anyway): <tablename>.ISM, <tablename>.ISD and <tablename>.frm files.

However, I have files like this in my directory: B-431a.ISM, B-431a.ISD, B-431a.frm..

The problem is : I have no tables named "B-431a" in my schema.

Anyone have an idea of what those files are ?