This is a logo of the organization S.O.S. Delta (Secret Organization Specialists)
The guy who's running this Organization is known as "The Boss", he's shrouded in shadow and no one in the organization has ever seen his true identity. The S.O.S. Delta is split into three factors;
The Specialist (they get almost impossible missions to complete, there are exactly 13 Specialists)
The Researchers (they are groups of scientists that invents weapons and security, they are also information brokers)
The Assassins (they are bunch of kids trained to kill, they have their own ninja school to harden their skills and knowledge).
However, don't be fooled by the name "S.O.S.", in the public eyes they think is a sign of the savors, but the truth is that they are not savors, simply killers, each and every one of them.
No one knows what's this Organization's objective is, not even the people who works there