Jisho

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Noun
1. floor space index; FSI; floor area ratio; FAR; ratio of building size to lot; plot ratio
Wikipedia definition
2. Floor area ratioFloor area ratio (FAR), floor space ratio (FSR), floor space index (FSI), site ratio and plot ratio are all terms for the ratio of a building's total floor area to the size of the parcel of land upon which it is built. The terms can also refer to limits imposed on such a ratio.
Read “Floor area ratio” on English Wikipedia
Read “容積率” on Japanese Wikipedia
Read “Floor area ratio” on DBpedia

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