The term GREEN SPOT can be broken down into two crossword solutions: OASIS (5 letters) and PSA (3 letters). OASIS stands for Organization of African Unity Summit, which was a summit held in Cairo, Egypt in 1964. It was attended by 32 African countries and aimed to promote unity and cooperation among African nations. PSA stands for Public Service Announcement, which is a type of advertisement that is broadcasted on television or radio to inform the public about important issues such as health, safety, and environmental protection.