Since 2019, March 10 has been celebrated as Mario Day, as when written as Mar10, it resembles the name of the iconic plumber. You can read about all things Mario in the Super Mario Wiki.
Mario is a fictional character in the Mario video game franchise owned by Nintendo. He is a short, pudgy, Italian plumber who resides in the Mushroom Kingdom and his adventures generally center upon rescuing Princess Peach from the villain Browser. Mario’s younger brother and sidekick is Luigi.