SN 2002cx is a peculiar type Ia supernova. It was discovered in May 2002 by a team of researchers from LBL. It behaved differently from normal type Ia supernovae, and differently from several other previously observed peculiar type Ia supernovae including SN 1991T and SN 1991bg.
SN 2002cx is now classified as type Iax supernova, which are subluminal and do not result in complete destruction of the progenitor white dwarf.