and the characteristics of the written form of the first language that one learns to write are the primary influences on the development of one's own unique handwriting style. Even identical twins who share appearance and genetics do not have the same handwriting.

Characteristics of handwriting include:
* the specific shape of letters, e.g. their roundness or sharpness
* regular or irregular spacing between letters
* the slope of the letters
* the rhythmic repetition of the elements or arrhythmia
* the pressure