Is there any weapon/armour the Romans invented ?

[Theodosius the Great]

Avete,<br>
<br>
I was wondering if there's a weapon or armor that the Romans could claim to be of their own invention ? Most if not all of their gear was adopted/borrowed/stolen from their enemies.<br>
<br>
Is the pilum a Roman invention ?<br>
<br>
How about segmented armour ? I know they weren't the first to pioneer it, but to my knowledge they were the first to create a complete segmented cuirass.<br>
<br>
-Theo <p></p><i></i>