Prid of Ankh-Morpork
The flagship of the Ankhian fleet during the war with Klatch.
The name is down to a signwriter who lost his concentration and only realised his mistake when it was too late.
We've all seen examples of dyslexic signwriting. While working on an industrial estate nearby to the depot of a well-known courier company, I saw a familiar brown van bearing the logo "Untied Parcel Service" on the side. I also used to pass a pub on the way to work that boasted "Disablabed Access" on the signboard by the main road.