each person has his unique style of handwriting.whether it is normal handwriting or signature.Even identical twins who share appearance and genetics son't have the same handwriting.They are like the finger prints.people might able to copy it but never the same.Because the different area od where one grow up,the different language one learns the first and the different distribution of the force,and the different ways of shaping our words:all of these melting together and create a unique style of handwriting .Each person handwriting is unique.