: Indicates the software is formatted for a dual-layer DVD image (ISO). Win-Server-STD Windows Server Standard
Expect NTLM v1 disabled, SMB1 absent, and possibly the removal of the legacy registry editor from Core (already only accessible via command line).
Still worth noting. There is no 32-bit Windows Server anymore. The last one was 2008 R2. The 64Bit tag persists purely for disambiguation in Microsoft's internal catalog, which still contains legacy entries stretching back decades.