Ladder Nesting 2 : The procedure whereby ladders of different sizes are positioned partially within one another to reduce the amount of space required for their storage on the apparatus
NFPA 1931 Standard for Manufacturer's Design of Fire Department Ground Ladders, 2004 ed. https://www.nfpa.org/assets/files/AboutTheCodes/19 32/1932-A2004-ROP.pdf, (Std: Mfg Design of Fr Dept Gr Ladr - Amer) {419 NFC}