Thế thì không biết

Còn cái sign này
SOS is the commonly used description for the International Morse code distress signal (· · · — — — · · ·). This distress signal was first adopted by the German government in radio regulations effective April 1, 1905, and became the worldwide standard when it was included in the second International Radiotelegraphic Convention, which was signed on November 3, 1906, and became effective on July 1, 1908.
SMS (Short Message Service)
function on a mobile phone that enables short messages to be relayed from one mobile phone to another
NASA (National Aeronautics and Space Administration)
n. American agency dealing with space travel and research of the universe
CIA (Central Intelligence Agency)
United States government agency that deals with national security issues
FBI (Federal Bureau of Investigation)
U.S. federal agency responsible for safeguarding national security
HBO (Home Box Office) is the premium television programming subsidiary of Time Warner. It offers two 24-hour pay television services - HBO and Cinemax - to over 40 million U.S. subscribers. The services include the subscription video on demand products, HBO On Demand and Cinemax On Demand, as well as multiplex channels and HD feeds. Internationally the subscription video on demand products HBO On Demand and HBO Mobile, along with HBO branded joint ventures, bring HBO services to over 50 countries. HBO programming is sold into over 150 countries worldwide.