[われまどりろん, waremadoriron](n) broken windows theory; criminological theory stating that serious crime can be prevented by maintaining the good physical condition of an urban environment[Add to Longdo]
[ししょくていり;よんしょくていり, shishokuteiri ; yonshokuteiri](n) four-color theorem (colour) (theorem stating that any map can be colored such that no two adjacent segments have the same color, if only four colors are used)[Add to Longdo]
[むなふだ;むねふだ, munafuda ; munefuda](n) sign staked to a building's ridgepole at construction time stating the building's donor, builder, date, reason for construction, etc.[Add to Longdo]