"Yahoo" is an acronym for "Yet Another Hierarchical Officious Oracle"

The search engine name ‘YAHOO’, rather than simply being a silly word that people can remember, is also an acronym. YAHOO stands for ‘Yet Another Hierarchically Organized Oracle’. The term ‘hierarchical’ in the title refers to how Yahoo’s database consists of categories with subcategories, which then have categories of their own and so on. The term ‘oracle’ was in reference to how searchers would search for truth and wisdom on the database. The term ‘officious’ referred to the many office workers who would use Yahoo to help them at their jobs.