Here’s a glyph inside JY Integrity that never got used beyond the original publicity in the mid-1990s.
Before there was OpenType, there was QuickDraw GX, and I was part of the consortium trying to sort out the character set, along with Allan Haley and others. We were using this newfangled collaboration tool called the internet. Cheekily, I did a gx glyph so we could tout the Integrity family as GX-compatible. It was in the original brochures in 1993 or thereabouts.
As history tells us, QuickDraw GX never took off, but the glyph is still inside the font family. Just for fun, we’ve kept it in the Pro version of the fonts, out later this year. It’s not linked to any alternative sets in OpenType, but it is accessible as part of the character map.