Wedged mortise and tenon joint.
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Previously:
https://www.homemadetools.net/forum/...501#post228403
https://www.homemadetools.net/forum/...855#post206622
https://www.homemadetools.net/forum/...827#post198369
https://www.homemadetools.net/forum/...371#post181451
https://www.homemadetools.net/forum/...468#post173721