Before all other weapons, Tenno master the Skana. This simple blade becomes immensely powerful in the hands of a master. For Tenno, it is the foundation of their fighting style and a pillar of their culture.
The Skana is one of three starting Melee weapons available to new Tenno during the Vor's Prize tutorial prologue.
A theory is that the name "Skana" might be a combination of the words "Space", because of the game being mainly ambiented in it, and "Katana", referencing the Japanese weapon, because of the tenno culture and reference of the 'old ways'. Both words combined could be the reasoning behind "Skana", Space Katana.