Inert positional wrapper for label and legend placement (used with ChartLabels etc.)
Placed[expr, pos]
Placed[{e1, e2, …}, pos]
Placed[{e1, e2, …}, pos, f]
ListPlot[{Range[10], Prime[Range[10]]}, PlotLegends -> Placed[{"one", "two"}, {Left, Top}]]
→ -Graphics-PieChart[Range[10], ChartLabels -> Placed[Range[10], "RadialCallout"], SectorOrigin -> {Automatic, 1}]
→ -Graphics-Table[BarChart[{1, 2, 3}, ChartLabels -> Placed[{"a", "b", "c"}, p], PlotLabel -> p], {p, {Bottom, Center, Top}}]
→ {-Graphics-, -Graphics-, -Graphics-}