This model called the "classic" has a mix of dots and square patterns. Its sides are higher than the center so the sugar cube stays still. Simple and light, this stainless steel spoon will get you started in the absinthe world at a very reasonable cost.
Since real absinthe has no additional sugar in it, spoons are used to hold a sugar cube above the glass while a fountain drips water on it in order to sweeten and dilute the drink. Once sweetened and mixed to your taste, use the spoon to stir the "purée" (old french slang for an absinthe diluted with cold water.)