Shank 7 : The reinforcement to the area of protective footwear designed to provide additional support for the instep when standing on a ladder rung. Also called Ladder Shank
NFPA 1971 Standard on Protective Ensemble for Structural Fire Fighting, 2000 ed. https://www.nfpa.org/Assets/files/AboutTheCodes/19 71/1971-A2006-ROC-Preprint.pdf, (Std: Prot Ens for Stru Fr Fight - Amer) {428 NFC}