Greneng

[David]

Originally Posted by kronckew

the kudi/kujang also has decorative notches on the top of the blade, on my pre-islamic one, they are well forward, over the 3 holes.

european blades frequently have decorative filework notches cut into the blade spine, scots blades are also frequently notched

could it just be that they are decorative items that have evolved into fancy forms & have become 'traditional' in some areas, adding more esoteric interpretations in later ages.

as not all kris blades have them, and some non-kris blades have them, i'd think that if they had a definite non-decorative kris specific function then all kris would have them to some extent, however they are apparently optional.

occam's razor (razors generally come without greneng )?

Your kudi looks like a fairly modern piece to me, not pre-Islamic.
Greneng is certainly much more developed than the notches found on European blades and the form does look very much like the Dha letter it is reputed to represent. It seems to me that they are much more than just decoration.
Keris were/are made on many different levels for many different classes of people and for various purposes. I don't find it surprising therefore that some keris have greneng while others do not.