Thanks to the help I received from @Ed Snible, I now know that this coin (below) is from Knidos, in Caria. My question is: what denomination should I call it? Hemidrachm? Diobol? Trihemiobol? Whatever I want? It is 12 mm and weighs 1.4g. Thanks for your thoughts. The obverse is a lion's head facing right and the reverse is the head of Aphrodite incuse.
At 1.4g you can call it a hemidrachm Or a triobol if you prefer it (3/6 obol = triobol = hemidrachm).