The "S" in Harry S Truman

[PBrunsel]

"I was supposed to be named Harrison Shippe Truman, taking the middle name from my paternal grandfather. Others in the family wanted it to be Solomon, taken from my maternal grandfather. But apparently no agreement could be reached and my name was recorded as Harry S Truman.”
-Harry s* Truman

•   NOTE: Due to the “S” not standing for a name, no punctuation is needed.

Truman is the only president to have such a middle name.

Just an historical fun fact.

[PBrunsel]

In his signature, he used a period after the S I think.

Yes he did. He commented he did that to not confuse school kids!

[PBrunsel]

Calvin Coolidge's real name was John Calvin Coolidge. Grover Cleveland's was Stephen Grover Cleveland, and Woodrow Wilson's was Thomas Woodrow Wilson.