Our twentieth letter, T, is particularly interesting because it is derived from “tahv” a mark or cross made by people who could not write, and no doubt their signature frequently resembled it. We must not forget that even Charlemagne and other kings of the middle ages had to make their mark or trace their initials through stencil plates. The only change of “tahv” to Greek “tau,” and to Roman T (tay) was the raising of the cross bar.