The ornamental design for a terminalblock, as shown and described.
FIG. 1 is a top, front and right side perspective view of a terminal block showing our new design;
FIG. 2 is a bottom, front and left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a cross-sectional view taken along the line of IX-IX of FIG. 3.
The broken lines depict environmental subject matter only and form no part of the claimed design. The dash-dot line represents the boundary of the claimed design.