Sica (3.5e Equipment)
From D&D Wiki
The sica (SEE-kuh) is brutal meat cleaver whose blade bends forty-five degrees about halfway down the blade. The curved, double-edged blade is designed to slash and fight around shields. You get +2 on attacks against an opponent with a shield. You can use a sica to make trip attacks. If you are tripped during your own trip attempt, you can drop the sica to avoid being tripped. Fighters may treat the sica as a martial weapon.