A “Late 2011 iMac” update may be imminent | Ars Technica
USB 3 Dock on 2011 iMac via Thunderbolt | MacRumors Forums
Amazon.com: Mini DisplayPort to HDMI Adapter for iMac Mid 2011(27-inch, 21.5 inches) Mini DP to HDMI Adapter Compatible with MacBook Air/Pro, Microsoft Surface Pro/Dock, Projector and More 1-Pack : Electronics
Apple publishes Thunderbolt support documents - 9to5Mac
Target Display Mode And Thunderbolt
Apple iMac 21.5" - QUAD CORE - 8GB RAM - 1TB - THUNDERBOLT - macOS High Sierra | eBay
Apple 27-inch Thunderbolt Display — One:One
Apple Thunderbolt Display 27-inch (Mid 2011)
Is it possible to use a 27” mid 2011 iMac as an external monitor for the new M1 Mac Mini? : r/macmini
The Display - The 27-inch Apple iMac Review (2011)
VESA Adapter for Select iMacs and Apple Displays – HumanCentric