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The various delta symbols do in fact show a partial charge. If you think about a water molecule, the two hydrogens will have a delta positive and the oxygen will have a delta negative. The arrows point towards the negative atom. So the point of the arrow will go towards the oxygen in the case of water. If you think about it, it is the way the electrons are being pulled.
The symbols represent partial charge. The negative partial charge goes on the most electronegative atom in a molecule, while the positive charge goes on the other atom. The dipole moments, which represent the arrows used, point from a positive partial charge to a negative partial charge (towards the most electronegative atom). To remember this, the + side of the arrow represents where a positive partial charge is, while the side that the arrow is pointing to represents where a negative partial charge is.
The +/- delta symbols represent partial positive and partial negative. The +-----> arrow points in the direction of the negative end of the dipole, with the "cross" end of the arrow towards the positive end of the dipole.
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