RtlInitializeUnicodePrefix - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H

NTSYSAPI
VOID
NTAPI
RtlInitializeUnicodePrefix(
    _Out_ PUNICODE_PREFIX_TABLE PrefixTable
    );

#endif

View code on GitHub

This function is documented in Windows Driver Kit.