Building block

Abstract

A building block comprising an octagonal building block body, the building block body has upper and lower surfaces thereof respectively provided with four symmetrical upper and lower protruding blocks, the upper and lower protruding blocks are respectively arranged in the shape of a cross, each of the upper and lower protruding blocks is respectively provided with an engaging notch; on the building block body, the four upper and four lower protruding blocks divide and form four planes, which are respectively provided with a notch, and a plurality of building blocks can be connected, by using the engaging notches on the upper and lower protruding blocks or the notches on the planes, in a diagonal engaging manner, a vertical engaging manner, or a horizontal engaging manner, so as to assemble a variety of building block combinations.

1 . A building block, comprising a building block body; wherein an upper surface of the building block body is provided with four upper protruding blocks, and the four upper protruding blocks are arranged in the shape of a cross, an upper notch is formed in the center of the building block body, and each of the upper protruding blocks has a top end thereof respectively provided with an engaging notch;
 wherein a lower surface of the building block body is also provided with four lower protruding blocks which are in symmetry to the four upper protruding blocks on the upper surface, the four lower protruding blocks are also arranged in the shape of a cross and form a lower notch in the center of the building block body, and each of the lower protruding blocks has a bottom end thereof respectively provided with an engaging notch.   
     
     
         2 . The building block according to  claim 1 , wherein the building block body is an octagonal building block. 
     
     
         3 . The building block according to  claim 1 , wherein the upper and lower protruding blocks on the upper and lower surfaces of the building block body are rectangular. 
     
     
         4 . The building block according to  claim 1 , wherein the four protruding blocks on the upper and lower surfaces of the building block body are arranged in the shape of a cross, and divide the building block body into four fan-shaped planes. 
     
     
         5 . The building block according to  claim 4 , wherein the four fan-shaped planes have arc-shaped edges thereof respectively provided with a notch in the center.