In all sectors of the entertainment industry, a one-sheet is a single document that summarizes a product for publicity and sales.
A speaker one sheet, otherwise known as a “speaker sheet” or “one-pager,” is a one-page document (one or two-sided) explaining who you are, what you speak about, and why the event planner reading it should hire you. In other words, your one sheet is a brief bio/resume for your speaking experience.
I have experience crafting bios/one-sheets for musicians/artists/authors, all unique to the individual and their brand.