It should come as no surprise that most torpedo levels are tapered or torpedo-shaped. What is surprising is how many uses people find for them. A torpedo level is small—6 inches to 12 inches in length—and have vials that indicate plumb, level and, sometimes, 45 degrees. Because of the torpedo levels diminutive size and shape, they’re ideal for working in tight spaces. Some have magnetic edges giving plumbers and those working with metallic parts a “third hand” while working. Torpedo levels fit nicely in a tool belt and junk drawer and are handy for leveling pictures, determining the slope of pipes and leveling over short distances.

- https://www.familyhandyman.com/article/diy-dictionary-what-i...