In the Dead Sea Scrolls, several other letters with Palaeo-Hebrew shapes are used as paragraph etc. markers.
Those would be Phoenician letters with RTL directionality used as markers in a traditional text. (That is given the current Roadmap which unifies Palaeo-Hebrew and Phoenician.)
So, if you wish, your shin could be submitted when they are--Elaine
The Samaritan shin is an LTR clone of, um, the Samaritan shin used in Western Biblical references.
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Michael Everson * * Everson Typography * * http://www.evertype.com

