Which is the unity of energy that contains the word zettajoule in it's name?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q2916980 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'zettajoule')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
unit of energy: Q2916980