Bing found the following results
x86-64 - Wikipedia
x64 Architecture - Windows drivers | Microsoft Learn
32-bit and 64-bit Windows: Frequently asked questions
How to Check if Your Computer is x64 or x86? - phoenixNAP
64-bit computing - Wikipedia
What is x86-64? | Definition from TechTarget
What Is the Difference Between 32 Bit and 64 Bit (x86 vs x64)
How to Tell if You Have Windows 64-Bit or 32-Bit - Lifewire
What's the Difference Between 32-Bit and 64-Bit? - Lifewire
x64 Definition - TechTerms.com