closing-sign, [152]-[153], [170]

explanation, [152], [161]

lack of, examples, [163]-[164], [175]

position, [152], [238]

Symmetry in glyphs, modifications due to, [23]-[24], [88]-[91], [128]

Terminal dates—

determination, [138]-[151]

importance as check on calculations, [154]-[155]

position, [151]-[154]

Textbooks, need for, [vii]