From the introduction:
The Sigil System is the backbone on which all Stormforge Productions’ RPGs are and will be built, and The Glyph System is The Sigil System’s smaller, quicker brother. The Glyph System can handle anything that The Sigil System can in a trimmed-down, fat-shaven, only-one-dice-needed platform.
Glyph is a light-weight generic, universal rules mechanic intended to support any genre of gaming. It shared various concepts and some mechanics with The Sigil System, but is a full-developed and standalone system.