Appointment Short Form is Appt
Short Form of Appointment is Appt. According to the dictionary of Cambridge appointment is a noun. In British English and American English, it has the same meaning. It is used as an arrangement or job.
Appointment as Arrangement: An appointment is the formal meeting with someone at an arranged place and at an arranged time.
She has cancelled her doctor appointment.
Appointment as Job: It is the act of choosing anyone for the job.
He has received his appointment letter as a project manager.