Salt spoons are tiny spoons used with individual salt dishes (salt dips) as part of a formal table setting. These special little spoons are found made of sterling silver, wood or glass and are typically about 2 1/4" to 2 1/2" long. This piece of formal tableware dates back to the 1600's.
Sadly salt spoons and individual salt dishes have gone the way of buggy whips and IBM Selectric typewriters. Most salt spoons will be found in the homes of collectors but some people (like me) still own them and use them on occasion.
There are still some inexpensive salt spoons made today and you can find them in specialty kitchenware shops such as Sur la Table. They are typically a little larger, about 3" and are used with a single master salt dish on the table or even a salt dish used next to your cook top.
You can also purchase old salt spoons on Ebay and Etsy and even Replacements.com.