Another couple important aspects of symbols: 1. They refer to the same object in memory, so multiple usages of a symbol by the same name (e.g. `:param`) not no

Another couple important aspects of symbols: 1. They refer to the same object in memory, so multiple usages of a symbol by the same name (e.g. `:param`) not not add additional memory overhead. 2. Symbols are also immutable in that they cannot be mutated in any way once they are referenced/created. These properties can be useful in some contexts, but in practice they're effectively used as immutable constant values.