The Starfleet Exploratory Division was an agency in the 24th century Starfleet. As the name suggests, it was the division in charge of exploration. This agency was named on the dedication plaques of Miranda-class and Nebula-class starships.
Admiral Michael Piller was noted for his work with the Exploratory Division on the USS Phoenix on stardate 40250.5. (TNG: "The Wounded", dedication plaque) He was later noted for his work on the USS Sutherland on stardate 44820.5. (TNG: "Redemption II", dedication plaque)