Z-rig
Z-shaped. rope-and-pulley rigging system that achieves a 3 to 1 mechanical advantage.
ZTV-Baumpflege
acronym for Zusiilzlicbe Technische Vertragsbedingungen und Richtlinien fiir Baumpllege. 2006 (Additional Technical Contractual Terms and Guidelines for Tree Care). In Germany. guidelines or best practices and definition of technical tenus for various areas of tree care.