Cable blocks

A block for a cable, wherein

• the block has a shape of a rectangular cuboid in which an upper surface and a bottom surface have square shapes,
• the block has plural through holes extending straight between one side surface of the rectangular cuboid and a side surface opposed to the one side surface,
• arrangement of open ends of the plural through holes in the one side surface of the rectangular cuboid is in a lattice manner and corresponds, of a first group and a second group, to the first group wherein the first group and the second group are defined so that alignment in line symmetry with respect to a middle line between an upper side and a bottom side of the one side surface and with respect to a middle line between a lateral side and a lateral side of the one side surface is divided into the first group and the second group, the open ends at the same height from the bottom surface belonging to the same group, the open ends of the first group and the open ends of the second group being in rotational symmetry with respect to a center of the one side surface, and
• arrangement of open ends of the plural through holes in the side surface opposed to the one side surface of the rectangular cuboid is the same as the arrangement of the open ends of the plural through holes in the one side surface of the rectangular cuboid.

A block for a cable, wherein

• the block has a shape of a rectangular cuboid in which an upper surface and a bottom surface have square shapes,
• the block has plural through holes extending straight between one side surface of the rectangular cuboid and a side surface opposed to the one side surface,
• the block has plural through holes extending straight between side surfaces neighboring the one side surface of the rectangular cuboid, arrangement of open ends of the plural through holes in the one side surface of the rectangular cuboid is in a lattice manner and corresponds, of a first group and a second group, to the first group wherein the first group and the second group are defined so that alignment in line symmetry with respect to a middle line between an upper side and a bottom side of the one side surface and with respect to a middle line between a lateral side and a lateral side of the one side surface is divided into the first group and the second group, the open ends at the same height from the bottom surface belonging to the same group, the open ends of the first group and the open ends of the second group being in rotational symmetry with respect to a center of the one side surface, and
• arrangement of open ends of the plural through holes in the side surface neighboring the one side surface of the rectangular cuboid corresponds to the second group.