You’ve heard the term TAA—for technically advanced aircraft. It’s an aging FAA definition for GA aircraft equipped with modern avionics. The term goes back to the early 2000s, and worth reading is the FAA’s 2003 general aviation industry safety study, which looks at TAA safety as it relates to avionics equipage. Link to it at https://tinyurl.com/msukwrhs.
Based on equipage, the FAA recognizes a TAA as having an IFR GPS with moving map, a multifunction display with weather, traffic and terrain graphics, plus an integrated autopilot. Although these days, autopilot integration is a pretty general term.