The following words are all reserved for internal functions in Lua.
- and,
- break,
- do,
- else,
- elseif,
- end,
- false,
- for,
- function,
- if,
- in,
- local,
- nil,
- not,
- or,
- repeat,
- return,
- pairs,
- then,
- true,
- until,
- while
These words cannot be used for variable names, but Lua is case sensitive, so 'and' is reserved and can't be a variable, but 'aND, aNd, AND, anD, AnD, And, ANd' are not reserved and can be used as variables.