The cardinality function, applied to the empty set, returns the empty set as a value, thereby assigning it 0 elements.
Titbǎqet tan anǎtfǎs, tijat i jǎmiɣ war eha hǎrt, suɣil jǎmiɣ war eha hǎrat šund alqim , kuddeɣ as hak 0 titbǎqqa