[minor syntax/markup edits]

One that has caught my fancy are various uses of the "Whatever Star". This appears as a * in a few contexts. In many it is really a shortcut for the "Whatever" class, so you can use it in function signatures to enter sort of "automatic mode".

  @shuffled_names = @names.pick(*) # randomly pick... however many you have. whatever.

But I think more interesting and different than that is using whatever-star as an automatic lambda thing.

  @nums.map(*/2 + 3)              # expression-lambda from context around a whatever-star
  @nums.map( -> $n { $n/2 + 3 } ) # equivalent with a real stabby arrow lambda
  @nums.map( { $^n/2 + 3 } )      # $^n is a generated alphabetical-positional argument

I suppose this isn't really fundamental... but is definitely different.