A small magnetic plate which can attach to a music stand has many many uses for holding magnetic objects that you may need or canno live without. Bulldog clips to keep music open, glasses cases, drink etc...

Or you can use the official one ..

The Trigger Triangle allows the player more speed and precision by supporting the triangle while it is played. It comes with a high carbon 5” triangle and the striker.
The 5” triangle, and a 6” triangle, both with strikers are available as well.
The Trigger Triangle can be mounted on a stand with a DSM and the optional accessory RT7960.