A Warship Keycard from the Tekunin Warship.
The Warship Keycards or in full Tekunin Warship Keycards are access cards belonging to the Tekunin Warship built by the clan of cyborg ninjas known as the Tekunin. They first appeared within the Konquest mode of Mortal Kombat: Armageddon, though one of them is called Sektor's Keycard since it belongs to the Tekunin clan's leader Sektor who commanded his warship.
This card can open any door on Sektor's Tekunin Warship. If he or any of his loyal Tekunin clansmen catches the one who stole it, they can surely expect a swift and painful death.