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