The origins of NOD32 trace back to 1987 in Bratislava, Slovakia.
The "32" was added when the software was rewritten for the 32-bit Windows environment, transitioning from a DOS-based utility to a proactive, real-time protection system. II. Core Security Architecture ESET NOD32 Antivirus
What is antivirus software, how does it work, and why ... - ESET The origins of NOD32 trace back to 1987