Null sign

In mathematics, the null sign (∅) denotes the empty set.

Common notations for the empty set include "{}", "∅", and " $\emptyset$ ". The latter two symbols were introduced by the Bourbaki group (specifically André Weil) in 1939, inspired by the letter Ø in the Norwegian and Danish alphabets (and not related in any way to the Greek letter Φ).

单词	Null sign
释义	Null sign 英语百科 Null sign In mathematics, the null sign (∅) denotes the empty set. Common notations for the empty set include "{}", "∅", and " $\emptyset$ ". The latter two symbols were introduced by the Bourbaki group (specifically André Weil) in 1939, inspired by the letter Ø in the Norwegian and Danish alphabets (and not related in any way to the Greek letter Φ).
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