Technical Classification & Vehicle Naming

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Abstractions about specialized numbering and classification schemes for industrial particles, aerodynamic performance, vessels, gliders, and military aircraft.

5 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Bort number — A visible side number used to identify a Soviet or Russian military aircraft within a unit or base assignment without necessarily being a globally unique airframe identifier.
• Oswald efficiency number — A dimensionless correction factor relating an aircraft’s lift-dependent drag to the ideal induced-drag expression for the same aspect ratio.
• RLM numbering system for gliders and sailplanes — A German pre-1945 designation system assigning common type numbers to glider and sailplane designs so drawings, licensed production, and spare parts could be coordinated across designers and manufacturers.
• Sibu classification — The traditional Chinese four-division bibliographic system organizing texts into Classics, Histories, Masters and Collections.
• World War II Allied names for Japanese aircraft — The Allied reporting-name system that assigned short, pronounceable category-coded names to Japanese aircraft for rapid identification and communication in the Pacific War.