French cleat
A french cleat is a way to hang things. It consists of two matching strips of wood with a 45-ish degree angle. Advantage is that whatever you are hanging wills stay level, and you can adjust it slightly left-to-right. Also, you can hang heavy things with it, and if you make it long enough to straddle studs you can hang your object where you want it, rather than where studs would let you.
I used one to hang my entrace rack. I also used one to hang my floating sink cabinet in my washroom, ie something I would fully expect a child to scale one of these days. I have sat on it, and it's not going anywhere.