Specific "SSK" prefixes are sometimes used in custom game mods or trading card series.

The final piece came in June, days after D-Day. The traitor was a Romanian double agent who fancied himself untouchable. Zara lured him to a church cellar with false promise of gold. He arrived to find Katty waiting, silver angel pin glinting in the candlelight. She didn’t ask who he worked for. She already knew. Instead, she said, “The angels remember every name.”