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As near as I can tell it appears to represent the share that you are holding of the SP steam fund. If you look up your profile on steemdb.com you will see a panel on the RHS that shows how many Megavests (1 million) you have. I presume that times the vest price is something like the value of your investment. So its kind of like a share price in Steemit instead of the value of the currency. That's a head scratcher.

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