Step 1: Understanding the Solid.
The solid shown is a 3D arrangement of cubes, forming a larger geometric structure. The image suggests a symmetric arrangement of smaller cubes stacked in a regular formation.
Step 2: Breaking the Structure into Layers.
Upon examining the structure, we observe that it is formed by smaller cubes, each with a side length of 1 unit, arranged in a 3x3x3 formation.
Step 3: Counting the Cubes.
The total number of small cubes in a 3D arrangement with dimensions 3x3x3 can be calculated as:
\[
\text{Total number of cubes} = 3^3 = 27.
\]
Therefore, the number of cubes in the structure is \( 27 \).
Step 4: Conclusion.
Thus, the total number of cubes in the given solid is \( 27 \).
Final Answer:
\[
\boxed{27}
\]