

I don't know what this is called and it's driving me crazy
Can someone please for the love of god and everything holy tell me what the heck this is called? I know I've seen it, but where?
Sorry for the photo of the screen, but I was kicking this around on a 3d model website, and it was hard enough to get this angle of the darned thing but I wanted to figure out what it is, and what size it should be relative to.
It's some kind of brace for a horizontal beam, but searching by image does nothing, I've drawn it several different ways, and I don't have many contractor friends/friends in construction.
I don't even know what to call the structure, an arbor/trellis for indeterminate tomatoes is what it is going to be, like in the second photo that isn't mine.