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The "Leonardo" module, also known as the Permanent Multipurpose Module (PMM), is a module used for stowage space on the ISS. "Leonardo" is attached to the forward-facing side of the "Tranquility" node. The PMM was delivered to the ISS by the STS-133 mission in early 2011. Originally the Multi-Purpose Logistics Module (MPLM) "Leonardo", it was converted to stay on orbit for an extended period of time prior to being installed on the ISS.