According to PANews, Musk's secondary account @cyb3rgam3r420 responded to @TERMINUS_CTO community member @wobuliangren's tweet "TERMINUS, the first city on Mars" at 3:44 pm EST on Twitter, with a simple reply of "cool".

$TERMINUS is a popular "space" series of tokens recently. Its concept is derived from Asimov's "Foundation" series of novels. TERMINUS is the name Musk gave to the first city on Mars in the future. According to Musk's latest tweet in September, he plans to start a rocket landing mission within two years, with the goal of building a self-sufficient city on Mars in about 20 years.