PDD meaning in Community ?

An inset day (an abbreviation of in-service training day), also known as a TD day (teacher development day), PD day (professional development day) or Baker day, is one of a series of five days in most schools in the United Kingdom on which teaching sessions are not run and the pupils do not attend school but the staff are required to attend for training or to complete administrative tasks. Teachers can catch up with work and also have the opportunity to train for any new technology or new ways of doing things within the school.