The printed “M” on a wedding response card comes from formal correspondence etiquette. It begins titles such as Mr., Mrs., Ms., or Miss, inviting guests to finish the appropriate title and add their names. Someone replying as “Ms. Jane Smith,” for example, would complete the printed letter with “s. Jane Smith.” This small convention helped maintain the polished, traditional tone of a formal invitation. It was a prompt, not a secret code or a test of whether you belonged.
Today, there is usually much less pressure to follow that format precisely. Guests can write their names clearly, using the titles they prefer—or none at all. If the printed letter does not suit your title, clarity matters more than forcing a fit. Follow the card’s instructions, indicate who will attend, and return it by the requested date. What matters most is helping the couple plan a celebration with the people they love.