Question: Give the lowest upper limit for a set of numbers that are a singleton of 0.
Paraphrase: For a set of numbers that are a singleton of 0, what is the lower upper limit?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q3054943 . ?ent wdt:P5448 ?obj . ?ent wdt:P527 wd:Q47342419. } ORDER BY ASC(?obj)LIMIT 5 
Answer: set of non-positive integers