Fancy brackets for ?

We love our new MultiCam CNC plasma cutter. All of a sudden we can cut metal of all thicknesses precisely and quickly. Complex shapes are no problem at all. That means some things I've been putting off are now possible. One such project is for the house... and will require twelve of these handy rigs. Any guesses what this thing is? Tomorrow evening I'll post a picture of them installed... Take a guess.