Question: Tell me notation whose name has the word symbol  in it.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q2001982 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'symbol')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25