Heavy Crystal Footed Bowl from a lot of American Brilliant -- Research turns up little info.
That's about all I can think of at the moment.  Have not idea what it is used for?  Maybe a salt, an open sugar or perhaps a container for a small scoop of sherbet?
Great Condition.
Specs:  18.13 Ounces or over a pound.
2" Diameter opening
3.5" Tall  --  About the size of a business card standing on end.
Design is alternating triangles.