WIKI defines it thus:
"...Ikigai (生き甲斐, pronounced [ikiɡai]) is a Japanese concept meaning "a reason for being", it is very similar to the French phrase Raison d'être. Everyone, according to the Japanese, has an ikigai. Finding it requires a deep and often lengthy search of self...."
I stumbled upon this graphic at a place called "Urban Samurai". Facebook suggested it for some reason, so I took a few seconds to check it out, and found this.
My mantra was always "where your interest and talent intersects", but I find this to be...deeper.
Posting here for your consideration.