Tongue & Groove (or Matching)
Wood pieces that join on edge with a groove in one piece and a corresponding tongue on the other to interlock. Commonly used on furniture doors for example.
Why End-Matched – The Tongue And Groove Store
Article End-Matched vs. Non End-Matched – Heartwood Mills
Prefinished Paneling -; Prefinished Paneling –
Joinery – Tongue & Groove
Tongue And Groove Siding – T&G Siding – Patterns And Pictures