Are there triple die coins?

My friend likes to collect double die coins and he was just curious on whether there were triple die coins.

This seemed intriguing to me, so I'd like to ask:

Has there been any triple die coins in the history of minting?

Best regards and thanks,
SRL

Never heard of triple die - but I found this one - so it must be true. Ed

http://www.pcgscoinfacts.com/Coin/Detail/96707

I think some of the rectangular Tongan pieces might be triple die.

Practically there can be triple, 4,5,6,.....
die coin. You have to understand how coins are made. In a press machine when a coin is accidentally punched twice it is called double die coin. And in worst case a coin accidentally can punched N- number of times before it can stopped.
One more reason for this is when die or punch get loose from its base, with every stroke of machine it shakes little bit forming a double letters appearing on coin. Before the machine operating realise this, hundreds or thousands of coin get punched with double lettering
The only thing is how these pieces accidentally comes out of the Mint.

I have seen this before
http://lincolncentresource.com/Errors/Triple_Strike.html

Double strikes and double dies are two seperate things. A double die exhibits the doubling on the die itself. You will see a clear seperation of serif on such a coin.