Decorticate posturing, indicating a lesion at the red nucleus or above.
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In other words, a decorticate lesion is closer to the cortex, as opposed to a decerebrate cortex that is closer to the brainstem.
From the en.wikipedia.org
Although it found other purposes, its main function to pound, decorticate, and polish grain that otherwise would have been done manually.
From the en.wikipedia.org
Decorticate posturing is a stereotypical posturing in which the patient has arms flexed at the elbow, and arms adducted toward the body, with both legs extended.