Sword of Shiva, really?

[Jens Schuetz]

Roman hunting knifes, ancient falcatas, and probably more blades have identical two parallel lines in the blade cheeks which are close to the spine and meet towards the tip.
The more modern Kukri has the same markings. In Kukris they are referred to as Sword of Shiva.
Since these markings are older than Kukris I wonder what their original meaning and function was.
I've been in India many times since my wife is from there and Shiva's usual weapons are the trident and bow. Most gods have lots of weapons so Shiva has provably some sword too but that's usually not what he's associated with.
Is Nepali Hinduism a bit different? Or was Shivas sword more important in the past? Why is it engraved in Kukris?

Or was it there long before Kukris? Nepali Kamis copied it from Alexander the Great or other European contacts and didnt know ir forgot about the original meaning / function and then linked it to some sword of Shiva? If so, good for us since without the religious meaning they might have just dropped this little detail over the centuries like Kukri handle guards for example.

Just guessing and waiting for the smarter and more educated to weigh in.

Thank you.

 

[Karda]

From the Khukuri FAQ:

Aunlo Bal - the small fuller or groove often found along part of the upper spine. sometimes also known as a 'blood-groove' or 'the Sword of Shiva' (origin uncertain).
Other terms used include: "pwankh (the 'feather'), rato karang ('red rib'...from when they used lac to highlight a design rather than using a real fuller), aunlo bal ('finger of strength/force/energy') and others I couldn't even get them to translate". -John Powell
"If the scrollwork and inlay in the Sword of Shiva had any meaning it has been lost in time. The scrollwork and inlay are the "khukuri system" which has been around forever". -Kami Sherpa
"Years ago the scrollwork was etched in by the kamis before the blade was hardened. Later some smart kami made a die so he could punch in the scrollwork and that's how it is done today. It is usually done after the blade is hardened. The brass inlay would not hold up to the heat". -Bill Martino