Samuel Langhorne Clemens, an iconic American author active primarily in the late 19th and early 20th centuries, adopted the pen name Mark Twain from his experiences working as a steamboat pilot on the Mississippi River. The phrase “mark twain” was commonly shouted by leadsmen, who were crew members responsible for measuring water depth. The call indicated the river depth was two fathoms, approximately 12 feet, indicating safe waters suitable for navigation.
Clemens, who cherished river life, found this nautical term symbolic of safety, clarity, and the depth necessary for a vessel to proceed without danger. He chose it as his pen name, reflecting his own affection for river life, and insightful writing style for which he became celebrated worldwide.
