Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:
Fewer Letters | More Letters ---|--- DNS | Domain Name Service/System NUC | Next Unit of Computing brand of Intel small computers PiHole | Network-wide ad-blocker (DNS sinkhole) RPi | Raspberry Pi brand of SBC SBC | Single-Board Computer
3 acronyms in this thread; the most compressed thread commented on today has 10 acronyms.