nullity
n.— «But Dr Anderson has come up with a theory that proposes a new number—‘nullity’—which sits outside the conventional number line (stretching from negative infinity, through zero, to positive infinity).» —“1200-year-old problem ‘easy’” BBC Dec. 8, 2006. (source: Double-Tongued Dictionary)
Further reading
Why does the term vegetarian cause so much confusion? Some people assume it means avoiding red meat but still eating chicken. And is there a term for a vegetarian who also eats fish and poultry? Plus, screwball comedies from the 1930s mix slapstick...
The sideways figure-eight shape used as the infinity symbol is a lemniscate (lem-NIS-kit or lem-NIS-kayt). The word comes from a Greek word meaning “ribbon” or “bow,” a nod to the shape’s resemblance to a tied ribbon. It also turns up in...