The Sia platform is home to Siacoin, a cryptocurrency that is becoming better known since its original release in2015. Its market cap has become a good yardstick by which to measure its success, and it finished inside the top 20 cryptocurrencies in 2017 when assessed in this way.
SC is the symbol by which Siacoin is known. The platform also offers a virtual currency called Siafunds. Siacoin is held in a storage space that is decentralized and can therefore be used by anyone who pays in Siacoin. As such, there is no blockchain involved here, which differentiates Siacoin from lots of other virtual currencies around today.