Trunnion
![The trunnions are the protrusions from the side of the barrel that rest on the carriage.](/Images/godic/202502/18/Belarus-Vitsebsk-Monument_to_Heroes_of_Patriotic_War_of_1812-64010.jpg")
![Trunnion positions saw table and provides a pivot point.](/Images/godic/202502/18/Saw_table_positioned_above_mounting_Trunnion4010.jpg")
![16th-century depiction of a cannon with trunnions](/Images/godic/202502/18/Renaissance_Cannon_24010.jpg")
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A trunnion (from Old French "trognon", trunk) is a cylindrical protrusion used as a mounting and/or pivoting point. First associated with cannon, they are an important military development.
Alternatively, a trunnion is a shaft that positions and supports a tilting plate. This is a misnomer, as in reality it is a cradle for the true trunnion.