This would be the new "read" icon, unchecked version.

University of Michigan - Ann Arbor

This is an alternative icon for the button that is used to mark notifications as "read," so that the upvote icon and the "read" icon are not the same, since they have different meanings.

Notifications "read" button

This is what the new icon for "read" would look like with the button checked.

Checked "read" button

"someone upvoted a node you worked on" instead of "the node where your proposal was accepted"

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