It is a particularly nice example of a rock shaped like a boat rudder and used in a rock pile. I have seen a lot of this shape, most often part of a pair on a rock for example this one from Acton:
Is this (from Boxborough) a variation?
Perhaps someone would say it is meaningless. I say it happens too often and must mean something. Let's start guessing and cross checking with other things. My best guess is that is represents a heart.
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