You're right, I was rushy. About the last letter I'm not sure of if it could be an N, since if we check the other N in the middle, they don't look similar. So it might be an A as you said, or an "error" on the wall.
The first letter might be an L, as it looks similar to the other L's in the inscription, or it can be an N too, like at the NA part. I'm unsure about that.
About the I-T problem, I don't know, might be both, as you already wrote down.
At the middle of the symbol there are more letters on both sides, at least they look letters for me. On the right, there might be an A or an N, while on the left an S and M, or an M only (there might be more too, but my eyes aren't that good), or they aren't letters, just "errors".
Anyway, it seems that this inscription is only a little remainder of the whole, which makes difficult to find out what the symbol is from it.
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