The image was taken from the original style used for the forum. We now have two styles to choose from: Aria and Tech Two. The reputation icons are there but they're no longer the scale icon. See below...
You can temporarily change your style by making a style selection at the bottom left of most forum pages. You need to go to your control panel to make a permanent change.
dipayankar - Your reputation altering power is 19 so you have 19 rights to decide someone's reputation
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Also remember, you can give someone positive or negative reputation points and you can give some or all of your reputation points.
--Robert