What is milisatoshi? I thought satoshi is the smallest unit?

What is milisatoshi? I thought satoshi is the smallest unit?

I encountered 'milisatoshi' (msat) while browsing Lightning Network..., see screenshoot below:

Taken from https://lnmainnet.gaben.win/

And subsequently I found it mentioned here:

https://github.com/ElementsProject/lightning/blob/master/README.md#sending-and-receiving-payments

Obviously I am curious... I thought satoshi is the smallest unit?

http://ift.tt/2BzkUwT

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