The Philadelphia gold and silver index represented by the symbol XAU ,but there is some confusion because it is closed under the ISO 4217 currency standard to denote one troy ounce of gold.

Red,White, Blue, Black ,Silver and Gold.

IG means Investor's Gold Index. This was the forum name for the OPGroup, and IG measured their gold stock index.

silver

The Goloid metric dollar was minted by the U.S. Mint in Philadelphia as a pattern coin, but it was not a typical silver dollar.

Goloid was an alloy that consisted of gold, silver and copper. The pattern coins were produced with varying amounts of gold and silver in the coins and the alloy was patented by Dr. William Wheeler Hubbell of Philadelphia. The idea was to replace all our silver coinage with goloid coins.

But for various reasons, the goloid coins were never approved and the idea was dropped.