(slang) A passenger on a cruise ship (so-called by employees after traffic cones, from the need to navigate around them)
(category theory) An object V together with an arrow going from V to each object of a diagram such that for any arrow A in the diagram, the pair of arrows from V which subtend A also commute with it. (Then V can be said to be the cone’s vertex and the diagram which the cone subtends can be said to be its base.)
A shell of the genus Conus, having a conical form.