Did {Pi} {different from} {Π}?
Is Pi the same as its symbol?
Are Pi and its symbol the same?
ASK WHERE { resource:Pi property:different_from resource:Pi }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q167> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1889> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q168>. } 
ASK WHERE { wd:Q167 wdt:P1889 wd:Q168 }