The term PT. OF SASE stands for 'Postal Technician of the United States Postal Service'. This is a job title within the United States Postal Service, which is a federal agency responsible for providing postal services in the United States. The Postal Technician is responsible for sorting and delivering mail, as well as providing customer service. The abbreviation ENV stands for envelope, which is one of the items that the Postal Technician would be responsible for handling.