Plimsoll Day is observed on February 10th and honors Samuel Plimsoll, a reformer who significantly improved maritime safety by introducing the concept of load lines on ships. These lines, painted on ship hulls, indicate the maximum safe loading limit, ensuring vessels do not become overloaded and remain seaworthy. The day encourages appreciation for the engineering and regulations that protect crews and cargo during maritime journeys. Celebrations can include learning about Plimsoll's contributions, spotting load lines on ships, and supporting shipping by purchasing items that arrived by sea. It also serves as a reminder of the importance of safety standards in both consumer and worker safety, highlighting the historical context of "coffin ships" that prompted these reforms. Sharing knowledge about Plimsoll's legacy with others is a common way to commemorate the day.