What does IHSV mean in Latin?

In hoc signo vinces

"In hoc signo vinces" (Classical Latin: [ɪn hoːk ˈsɪŋnoː ˈwɪŋkeːs]; Ecclesiastical Latin: [in ɔk ˈsiɲɲo ˈvintʃes]) is a Latin phrase conventionally translated into English as "In this sign thou shalt conquer". The Latin phrase itself renders, rather loosely, the Greek phrase "ἐν τούτῳ νίκα", transliterated as "en toútōi níka" (Ancient Greek: [en tóːtɔ͜ːi níːkaː], Greek pronunciation: [en ˈtuto ˈnika]), literally meaning "in this, conquer".

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