Signature is minimum set of letters which gives maximum information about a person. You can find a lot of fellow surrounding you having entirely different images at personnel level and at public level e.g. some one who is very daring at public is very nervous, fearful at home front/personnel level, and vice versa. People have two different images depending on the difference in their handwriting/script and signature. More the difference in script v/s signature, more the variation in two images of a person reflected in their personality.