Source: A 1931 dictionary
Pato (पातो) is the Nepali word for the side or "shoulder" of a khukurī blade. 1
Other meanings: Page (of a book); the small piece of tile put in a hookah above the tobacco; shoulder-blade; tyre of a wheel.
A mid 19th century khukurī.
For a complete overview of khukurī terminology, see my article: A Nepalese khukurī glossary.
1. Sir Ralph Lilley Turner; A comparative and etymological dictionary of the Nepali language. London: K. Paul, Trench, Trubner, 1931.