SOMETIMES YOU NEED AN EXTRA HAND
Ideally, you should always hold your triangle up directly in front of you for concert applications - but sometimes it's more complicated. Especially in theatre or multi-percussion circumstances, sometimes you need to just mount a triangle for convenient quick notes.
The Danmar #20B is just the solution, with a sturdy clamp and simple suspension you can easily add a triangle to the vertical section of any cymbal/percussion stand.