The ornamental design for a terminalblock, as shown and described.
FIG. 1 is a front elevation view of a terminal block showing my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a bottom plan view, with a cover removed, thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a top plan view thereof.
The broken line portion in the figure drawing views is included for the purpose of illustrating unclaimed environment and forms no part of the claimed design.