The RX-78 Gundam is the iconic Gundam mecha design, introduced in 1979 in Yoshiyuki Tomino's and Sunrise's anime series Mobile Suit Gundam. InMobile Suit Gundam, it is a testbed weapon for the Earth Federation, when it falls into the hands of Amuro Ray, the son of a weapons designer, who goes on to pilot it in the Earth Federation's war against the Principality of Zeon.
As the success of Mobile Suit Gundam began the Gundam franchise, this design was the first of many variations in subsequent works. The design appearing in Mobile Suit Gundam, called the RX-78-2 Gundam serves as the iconic symbol of the Gundam franchise and sparked the creation of its multiple sequels and spinoffs. The MSN-02 Zeong (sometimes Ziong or Jiong, see here) is a fictional mobile suit designed by Kunio Okawara for the anime Mobile Suit Gundam.