From Seo Wiki - Search Engine Optimization and Programming Languages
Global context registries are a simple, human-friendly way to indicate the global context of an i-name or i-number. There are three key types of global context registries, each represented by a single symbol as shown.
| Type || Global Context || Symbol || Example i-names || Example i-numbers
| Personal || Individuals || = ||date=Mary.Jones.Smith || =!2D37.90C1.FA48
| Business/Organizational || Any type of Trade Mark or Trade name || @ || @Johnson.Brothers || @!1057.A22C.4E83
| General || General concepts, subjects, topics || + || +flowers, +flowers/roses || +!2640, +!2640/3364