What did the pseudonym samuel clemens gave himself pay tribute to?

I believe the answer for the above question is his days as a riverboat Captain.

A pseudonym is a fake or fictitious name for example, an authors pen name, or a name that someone might use on the internet that is not their real name. A pseudonym is a made-up name used by a person to conceal their identity. It is most commonly associated with writers and are referred to as "pen names". A famous example would be Samuel Langhorne Clemens who is more commonly known by his pseudonym Mark Twain.