That is true about the term Howdah---"A howdah, or houdah, also known as Hathi Howdah, is an elephant mount, a carriage which is positioned on the back of an elephant, or occasionally some other animal, used most often in the past to carry wealthy people or for use in hunting or warfare. It was also a symbol of wealth for the owner, and as a result was decorated with expensive gems."
The misconception is often that howdah means double barreled pistol; it does not. From my research it appears there were many double barreled muzzleloaders, both flintlock and percussion and there was a certain double barrel percussion type that most recently got the label "howdah pistol" and those are the common ones in reproduction NOW. But that is not to say they would be the only ones that were used as Howdah pistols.