Really, this seems the weight of the horizontal stroke? why? strokeshortoverlaycomb
That is a combining accent across a single stem. In Latin, this can be used for the crossbar in dcroat, tbar, hbar. And strokeshortoverlaycomb.case for the uppercase letters Eth (which, by default, serves as a component for Dcroat) and Tbar.
For uppercase Hbar, it will be a strokelongoverlaycomb.case, because it crosses two stems.
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