The ornamental design for a baluster, as shown and described.
FIG. 1 is a front perspective view of the baluster;
FIG. 2 is a front eleveational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The baluster is shown with a symbolic break in its length. The appearance of any portion of the article between the broken line break lines forms no part of the claimed design.
The thin solid lines in the views have been provided for the purpose of illustrating the uniformity of the planar surfaces and the contour of the curved surfaces and are not a claimed surface pattern.