What what is unary operation notation by integral symbol and which that starts with 'i'
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q657596 . ?sbj wdt:P913 wd:Q1665420 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'i')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
unary operation: Q657596 integral symbol: Q1665420