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Master Link
From WikiPedalia
A special chain link (actually, half of a link) designed to be easily disassembled and re-assembled. Most simple bicycles have these, but they are not generally used on bicycles with derailer gearing, because conventional master links are too bulky to clear the closely-spaced sprockets.
The Craig Super Link, SRAM Power Link, KMC Missing Link and Wipperman Connex are special master links that work with derailer gearing, and a good choice for a cyclist who wishes to be able to remove the chain for cleaning.
The article about chain cleaning includes more information about master links.
