Sort:  

It's a generic placeholder symbol name. When the worldwide community of BP's launch the mainnet, they will first need to fork the EOSIO source on github, and rename SYS back to EOS. In doing so the community will be taking custody of the fork, and the launch of the mainnet. It seems to be an additional step that block.one is taking to distance themselves from being complicit in the launch of the mainnet.

Coin Marketplace

STEEM 0.21
TRX 0.20
JST 0.034
BTC 99331.95
ETH 3298.98
USDT 1.00
SBD 3.05