The term 'HAIRDO FOR THE JACKSON 5' can be summarized by the four-letter crossword solution 'AFRO'. This hairstyle was popularized by the Jackson 5, a Motown family group from Gary, Indiana, in the late 1960s and early 1970s. The AFRO was a large, often spherical hairstyle that was created by allowing the natural hair to grow out without any chemical treatments or styling. It became a symbol of African American pride and was adopted by many celebrities and musicians.