What is the name of the ancient Mandalorian lightsaber-like weapon?

The story behind the answer

It’s the unique black-bladed lightsaber forged by Tarre Vizsla, the first Mandalorian Jedi. Recognizable by its flat, katana-like profile and white-edged black blade, it became a cultural symbol: leadership of Mandalore is traditionally claimed by winning it in combat. Its storied path spans The Clone Wars, Rebels, and The Mandalorian.

Don’t be fooled by the distractors: “The Black Saber” is a common misnomer fans use but isn’t the canonical name; “Shadowblade” doesn’t refer to any established Star Wars weapon; and “Kryze Saber” evokes House Kryze (like Satine and Bo-Katan) but no such named weapon exists.