Why General Products needs a named science-fiction setting

What is a General Products No. 4 hull?

The setting must be identified first: the panel recalls both modular standardized hulls and Larry Niven's nearly indestructible Known Space hulls under the same General Products name.

The name General Products does not identify one technology for these participants. Clarke recalls standardized hull forms that can be reconfigured and combined into different spacecraft. Another participant finds a nearly indestructible transparent spherical No. 4 hull associated with Known Space. The two descriptions concern materially different systems. The requested setting remains insufficiently specified for an agreed technical assessment.