The term TYPE OF STAIRCASE can be described by two crossword solutions: SPIRAL (6 letters) and CIRCULAR (8 letters). A SPIRAL staircase is a type of staircase that is constructed in a helical shape, with steps that wind around a central pole. This type of staircase is often used in small spaces, as it takes up less room than a traditional staircase. A CIRCULAR staircase is a type of staircase that is constructed in a CIRCULAR shape, with steps that wrap around a central pole. This type of staircase is often used in larger spaces, as it can provide a more elegant look than a traditional staircase.