This is one of the most common questions about khukuris and can be seen almost everywhere that people are talking about these blades. It makes sense too. Chos are a very strange looking addition to a blade from a western perspective and every tom, dick and harry has some perspective on the matter. We've covered it in smaller detail elsewhere, but this recent question by @DangerZone98 made us feel like a dedicated thread was worthwhile. This is a functional side of the cho question which is seldom asked and one that we haven't seen addressed. Before we can get to that though let's cover the basics. What is a Cho? A cho, also commonly called a Kaudi in Nepal or a "khukuri notch" in the west is a cutout placed just in front of the handle that's ubiquitous on almost every traditional khukuri ever made. It's worth noting that though this current bisected semicircle is the most commonplace (especially on modern blades) there are many variants. Older khukuris had a much wider and shallower notch with a smaller prong, chitlanges have enclosed or "hooded" cho designs and many many blades defy this design entirely, especially in india, Here's three antique blades showing some extreme variations from VK Kunwor. What these hope to show is that there is no unified design and that explanations heavily reliant on the form are somewhat flawed. The purpose, function or meaning of this blade feature is currently a mystery, no matter what anyone tells you. There are hundreds and hundreds of explanations I've seen for this feature and I'll list a few notable ones in order of least sensible to most likely, with a bit of explanation.