Table 5.30 — ECs whose label begins with Z

Label Concept definition Code
ZEBRA A wild African <HORSE>, characterized by having an erect mane, whitish hide and distinctively black stripes; a zebra [SOED, "zebra", 1]. 1427
ZOO An <ANIMAL_PARK> where wild <NON_HUMAN_ANIMAL>s are kept for study, breeding, or exhibition to the public; a zoo [SOED, "zoo", 1]. 1428

http://www.iso.ch/iso/en/ittf/PubliclyAvailableStandards/ISO_IEC_18025_Ed1.html