1) Character 2) Grapheme 3) Graphic symbol 
• (n.) A writing or signature made by some person other than any of the parties thereto; -- opposed to autograph.
Al'lo·graph noun [ Greek ... another + - graph .] A writing or signature made by some person other than any of the parties thereto; -- opposed to autograph . 
[n] - a variant form of a grapheme as `m` or `M` 2. [n] - a signature made by one person for another
noun a variant form of a grapheme, as `m` or `M` or a handwritten version of that grapheme
a variant form of a grapheme that is in complementary distribution or free variation with another form of the same grapheme, as t and T or n in run and nn in runner; an orthographic contextual variant. Cf. grapheme. · writing or a signature inscribed by one person for another, as distinguished from autograph. · a deed or other legal do...