Proposed Definitions (not finished yet)
<!-- The aleph is aleph symbol, U+2135, not the letter aleph, U+05D0. -->
- xo
- question word to which the answer is a number
- ci'i
- infinity; when followed by a number, denotes a transfinite cardinal, such as ℵ<sub>0</sub>, or a transfinite ordinal, such as ℵ<sub>0</sub>.