<Tr> <Th> Symbol in HTML </Th> <Th> Symbol in TeX </Th> <Th> Name </Th> <Th> Explanation </Th> <Th> Examples </Th> </Tr> <Tr> <Th> Read as </Th> </Tr> <Tr> <Th> Category </Th> </Tr> <Tr> <Td> א </Td> <Td> א (\ displaystyle \ aleph) \ aleph </Td> <Td> aleph number aleph set theory </Td> <Td> א represents an infinite cardinality (specifically, the α - th one, where α is an ordinal). </Td> <Td> N = א, which is called aleph - null . </Td> </Tr>

What does the u stand for in math