There is already exist some Ethereum-based token, with ticker SXAU: https://coinmarketcap.com/currencies/sxau/
and this have just 256 holders: https://etherscan.io/token/0x261EfCdD24CeA98652B9700800a13DfBca4103fF#balances
Maybe... SAU (like Satori Aurum?), or something MSG (Mineable SatoriGold) - three chars for this tickers used.