Here are three kinds of PR travel documents depending on your situation
1. Confirmation of Permanent Residence document (COPR): This can only be used by PR visa holders to enter Canada but can't be reused for travelling. It's a single-entry travel document for PR visa holders.

2. Permanent Residence Travel Document (PRTD): If you leave Canada without your PR card, you misplaced yours abroad, and yours expired while you're away, you'll need a PRTD to reenter the country. It's a single-entry travel document for PRs.

3. Permanent Residence Card (PR Card): This is a government-issued I.D.card & a reusable travel document. It's a multiple-entry travel document for PRs.