* splat operator
** double splat operator, (used for methods with keyword arguments)
== equality operator
=== case equality operator
case subsumption operator
=> hashrocket, hash rocket, (between keys and values in the definition of hashes)
<=> starship operator
comparison operator
&. lonely operator
safe navigation operator
optional chaining operator
safe call operator
null-conditional operator / nil-conditional operator
<< shovel operator