Lukas Pietsch wrote:
Looks to me like the proofreader's marginal deletion mark. F7AA might also be a proofreader's mark.Your F725 Unknown-2, to me, looks like a German SCRIPT CAPITAL S, (compare with U+2112;SCRIPT CAPITAL L). Yes, we were taught to write an S like this in school. Perhaps it's used somewhere in mathematics?
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Curtis Clark http://www.csupomona.edu/~jcclark/
Mockingbird Font Works http://www.mockfont.com/

