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It's a new concept to be used. It describes a set of human skills. At this stage, I am not aware of any tool or assessment which would measure your SQ (spiritual intelligence).
It's a term which is more and more widely used. This means that humankind is simply growing and expanding this ability to perceive the larger view. In a way, this expansion of awareness could be the reflection of the globalization and modern high speed communication and environment we live in.
http://vitalcoaching.com/spiritualpower.htm
http://vitalcoaching.com/babaji.htm