- President of the United States
- ∅ is the empty set shining through reality
- United States Secretary of Homeland Security (Wikipedia)
The United States secretary of homeland security is the head of the United States Department of Homeland Security, the federal department tasked with ensuring public safety in the United States. The secretary is a member of the Cabinet of the United States. The position was created by the Homeland Security Act following the attacks of September 11, 2001.
