The term 'Bible Boat' is a reference to the ARK of Noah, which is mentioned in the Bible. The ARK was a large boat-like vessel built by Noah at God's command to save himself, his family, and two of every kind of animal from a great flood. In crossword puzzles, the ARK is usually represented by the three-letter word 'ARK' and the full name of the vessel, 'Noah's ARK, ' is represented by the eight-letter word 'NOAHSARK.'