I see the IV or roman 4 , but the image is cropped, so I wouldn't really consider it much, but I have seen IV on sites relating to bible verse stuff. It could be 111 V or 111 x V =555, or 111, IV or 111 x 4 =444 as well, depending how you look at the trees and the spaces in between, but it wouldn't matter because the actual alignments you go from and go to would get you that in the end. You can drive yourself crazy trying to figure out too much stuff from this, there is just no way of really knowing some of the hints, you pretty much have to stick with the main things that point, line up , and or look and the compass bearing they are on.
Also being a 2d image I can't tell if the trees would line up like I suggested as a goal post and tree to line up inside the uprights. These are typical alignments I have seen being used, as well as a large boulder being a wedge when standing or looking on the top of it and pointing a general direction. Even just the spilt tree being V being used as a gunsite somehow.. it doesn't have show something in the V, it can just be aligned to a compass direction to go to a place anywhere's from less than a 100 feet to several hundred yards, but likely in other units of measurement like varas or spanish feet. There's a ton of variations from site to site, but the varations have things in common as well.