Leaf scars (from where the petioles - leafstalks - were attached) of American Beech - Fagus grandifolia - creates an uneven edge to its twigs.
It can make them look as if they have a zig-zag form, and yes, that's probably because the leaves are attached and arranged alternately along the stem.
It makes the twig look like a finger with many knuckles - a little detail so easily missed.
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