“Mauve alert was the universally recognised colour for danger, signifying the highest level of...Mauve alert
“Ultimate Code Red was a declaration by the United Nations, signifying a large-scale alien...Ultimate Code Red
“A quarantine beacon was, according to the Tenth Doctor, a signal that prevented someone from...Quarantine beacon
“Code Nine was a priority alarm initiated when computer software — activated on the release of...Code Nine
The following 19 pages are in this category, out of 19 total.