A joint issue is a type of stamp that is issued by two or more countries at the same time. The term 'joint issue' is often used to refer to stamps that are issued in conjunction with a special event, such as an anniversary or a celebration. The crossword solution for the term 'joint issue' is GOUT, which stands for 'Global Outreach and United Ties'. This term refers to the idea of countries working together to promote global understanding and cooperation.