It depends, sometimes they are called blanks, other times they are called planchets, occasionally you will hear them called flans. All of them are correct though the term planchet or flan is used more with coin collectors while the term blank is used by pretty much everyone else.
You are a little spare on information. What country is it from? Does it have a denomination or an inscription on it? What is the diameter? What is the design on both sides? Is it a coin, a medal, a medallion or an IOC souvenir?
the side of a coin or medal bearing the principal stamp or design so like on coins such as state quarters it is the side with the face on it. The face that does not change through out the whole 50 state quarters.
Try Obverse
Coin relief refers to the raised design or image on a coin that stands out from the background. It is achieved by using a die with the desired design that stamps the image onto a blank coin. The level of relief can vary depending on the design and the technique used in minting the coin.
Goethe Medal is an old coin that is given as an award. A Gesellachaft is a German coin.
The metal disc used to make a coin is called a "coin blank" or, more formally, a "planchet." They also used to be called "flans," but that term is no longer as widely used.
The design on the reverse of the Half New Penny coin was a crown.
It is a medal, not a coin and they are valued from about $10 to $20.
The letters on the Nobel Prize medal stand for the founder of the prize, Alfred Nobel. The front of the medal typically features a portrait of Alfred Nobel and the reverse side usually has a relevant design to the specific field of the prize awarded.
The design is more nice
It is a medal, not a coin and they are worth $30 - $35.