What does this mean on Steem `black-man (25)`

black-man(47)
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Hi everyone reading this. I am new on Steem and I am trying to figure out what the number that is attached to your username mean. I see others with higher numbers and so on...

Screen Shot 2018-02-05 at 12.34.31 PM.pngLike the example image below

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What does this mean on Steem `black-man (25)` | Ecency