I'd like to know how to add a corner symbol directly above a letter in math-mode, such as in the following image:

Corner over lambda

I have tried the commands \urcorner or \ulcorner from the amssymb package and they are not what I need.

\mathfrak{L}(x) =\partial^\mu \URcorner\lambda(x)...\URcorner x

enter image description here

If it is need in the smaller math styles, please let me know.

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