Blue Above Red refers to the blue part of the Philippine flag remaining above the red part, as originally designed.
Reversing the colors to having the red above the blue is an indication of a state of war.
The phrase “Blue Above Red” with the accompanying image burst into the consciousness of Filipinos on social media after President Duterte declared martial law for the island of Mindanao in the wake of Muslim clashes in Marawi.
On Twitter, it has been translated into Tagalog as Bughaw sa ibabaw ng pula.
@TagalogLang Bughaw sa ibabaw ng pula.
— Save the Bees (@Hero_bee_) May 24, 2017
