Complex sentence: Nerdfighters have adopted the initialism "DFTBA", standing for "Don't forget to be awesome", as their slogan, as well as a hand sign, which is similar to the Vulcan salute seen in "Star Trek".
Split into simpler sentences: Nerdfighters have adopted the initialism "DFTBA", standing for "Don't forget to be awesome", as their slogan. The community has also developed a hand sign, which is similar to the Vulcan salute seen in "Star Trek".