Peter T. Daniels scripsit:

> Can you draw a continuous line over several letters using that
> character?

That's font-dependent. The combining overline (as opposed to the macron)
guarantees continuity with its neighbors, and is specified for use with
letters-as-numbers and with abbreviations. For the syllabic-consonant
use, the combining macron, the combining grave (in Akhmimic text),
and the combining dot above (in Bohairic text) are preferred.

See http://std.dkuug.dk/jtc1/sc2/wg2/docs/n2636.pdf for details.
This proposal provides a core Coptic set; in particular, it does not
handle all dialects, and it does not handle Old Nubian at all.

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