Building block

The ornamental design for a building block, as shown and described.

FIG. 1 is a perspective view of a building block showing my new design.

FIG. 2 is an end elevational view thereof.

FIG. 3 is a front elevational view thereof, it being noted that the rear elevational view is identical to the front elevational view in appearance.

FIG. 4 is a bottom plan view thereof.

Patent	Priority	Assignee	Title
11384539,	Jan 09 2020		Masonry block system
D829248,	Feb 18 2016	FSBL ACQUISITION, INC ; FOSBEL, INC	Regenerator wall block
D916153,	Feb 18 2016	FSBL ACQUISITION, INC ; FOSBEL, INC	Regenerator wall block
D956838,	Feb 18 2016	Fosbel, Inc.; DSF REFRACTORIES AND MINERALS LIMITED	Regenerator wall block

Patent	Priority	Assignee	Title
1034033,
1070870,
2975853,
3330079,
4426815,	Jun 05 1978		Mortarless concrete block system having reinforcing bond beam courses
191045,

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