Transistor having three terminals are Emitter, Collector and Base. In Green transistor technology the three terminals are represented by colors. They are
Hi Shiromani, I think Mark has pointed out the right one. This terminology was first used by Chenming Hu during 2008. He has proposed the design of a transistor that can operate at much lower suppy voltage or Vdd compared to conventional FETs. Due to its capability of power saving it was termed as gFET. You may want to check the following link