IHS: monogram or symbol representing the Greek contraction of "Jesus": sometimes regarded as an abbreviation of the Latin phrase meaning "Jesus, Savior of Men"
INRI: often seen on a banner of latin cross: "Iesus Nazarenus Rex Iudaeorum". Latin for Jesus of Nazareth, King of the Jews (John 12: 19-22)
MEMENTO MORI: "remember death"
TEMPUS ERAT: "time is gone"; "time has run out"
XP: Chi Rho-first two Greek letters of the word "Christ"