A technician is reviewing the blueprints for a precision-machined component shaped like a 'double cone' (two identical cones meeting at their tips). What is the specific geometric term for one of these two individual cone-shaped surfaces?

An apprentice at a precision glassblowing shop is learning to make hourglasses. Their mentor explains that the hourglass shape is mathematically a double cone, consisting of two identical cones meeting at their tips. To correctly identify one of these two individual cone-shaped surfaces in their technical notes, the apprentice should use the term ____.

A technical illustrator is creating a manual for a 3D modeling program. The manual states that when two identical cones are joined at their vertices to form a 'double cone,' the term 'nappe' refers to the entire combined structure rather than just one of the individual cone-shaped surfaces.

Terminology for 3D Mechanical Modeling

Documenting 3D Geometry for CAD Trainees

CAD Modeling for Custom Support Brackets