Thisbookdocumentsthehistoryofpifromthedawnofmathematicaltimetothepresent.Oneofthebeautiesoftheliteratureonpiisthatitallowsfortheinclusionofverymodern,yetaccessible,mathematics.Thearticlesonpicollectedhereinincludeselectionsfromthemathematicalandcomputationalliteratureoverfourmill