The signatures on official documents and notes are generally written horizontally. It is necessary to sign the date and stamp at the end of the document to show that it is legal and fair.
In ancient times, letters, calligraphy and paintings all had inscriptions. When giving gifts, the name and date were written vertically with a brush to show the giver and the recipient. This is also a form of expression of calligraphy art. A calligraphy work should be completed in a holistic sense, and the inscription can show the accomplishment and talent of a calligrapher. Nowadays, many people sign official documents and notes, which are generally written horizontally, indicating that they have legal effect.