I believe it can refer to the part in the middle of the toggle on the right of a M1900 Luger that clips over an extension of the frame when the pistol is in battery. It prevents the toggle from rising without first moving the receiver back on the frame.
Alternately, it could refer to the small pin that holds the toggle's axle in place on the M1906 and later Lugers.
P51 of the Lugerforum FAQ document discusses this.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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