Harry S. Truman, the 33rd President of the United States, is known as just that – Harry S. Truman. Leading some to wonder what exactly the “S” stands for?!
Some presidents do not have a middle name (George Washington), a few actually went by their middle name instead (Woodrow Wilson’s first name was actually Thomas) while others’ middle names are well-known (Franklin Delano Roosevelt). Truman, however, was the only president whose middle name is only one letter. “S” is not short for anything. Instead, he was named after both of his grandfathers, Anderson Shippe Truman and Soloman Young. So the “S” honors both of them.
From a technical standpoint, the “S” should stand alone without a period. But, according to the Harry S. Truman Library and Museum, Truman himself often signed his name with a period after the letter. And so, for continuity sake, it still is written that way.