Each row in the SYSINDEXES view describes one index in the database. As an alternative to this view, you could also use the SYSIDX and SYSIDXCOL system views.
The SYSINDEXES view is a SQL Anywhere consolidated view. See SQL Anywhere 11.0.1 > SQL Anywhere Server - SQL Reference > System Objects > Views > Consolidated views > SYSINDEXES consolidated view.