In hoc signo vinces

"In hoc signo vinces" is a Latin phrase conventionally translated into English as "In this sign thou shalt conquer", often also being translated as "By and/or in this sign, conquer".

The Latin phrase itself renders, rather loosely, the Greek phrase "ἐν τούτῳ νίκα", transliterated as "en toútōi níka", literally meaning "in this, conquer".