Thread

A line of thought or action; delicate or fine connections or directions, that can be easily lost or broken unless great care is taken. Or can mean a fine or tiny idea, or energy, we may easily lose, as when life hangs by a thread.

It can sometimes indicate a thread that links many lives, and can be a positive or negative influence frim the past; a family influence inherited from our family, that may be in many lives. See Conjuring Trick