 … 0 and 1 and all the other cardinals, according to [our] definitions, are ambiguous symbols, like cls, and have as many meanings as there are types. To begin with 0: the meaning of 0 depends upon that of Λ, and the meaning of Λ is different according to the type of which it is the null-class. Thus there are as many 0’s as there are types; and the same applies to all the other cardinals.