The question is about identifying the symbolical joints from a given list of joint types. Let's examine each type of joint mentioned in the options to determine which are symbolical joints.

1. Hinge Joint: This is a type of joint that allows motion mainly in one plane, like the elbow or knee. It serves as a symbol for flexibility and movement within a constrained range.
2. Saddle Joint: Found in joints like the thumb, it allows more motion than a hinge or gliding joint, providing greater flexibility and the ability to move in multiple planes. This joint can be symbolic of adaptability.
3. Irregular Joint: This term typically refers to joints that do not fit a common classification and often have unique structures and movements. It is not usually used as a symbolic representation.
4. Pivot Joint: This is a type of synovial joint that allows rotational movement, for example, allowing the head to turn from side to side. It symbolizes rotation and the ability to change direction or focus.
5. Fibrous Joint: These joints connect bones without allowing any movement, such as the sutures in the skull. They symbolize strength and stability.

By analyzing the above descriptions, we can conclude that the joints that have symbolic meanings related to flexibility, adaptability, and change in direction are:

• Hinge Joint (A)
• Saddle Joint (B)
• Pivot Joint (D)

Therefore, the most appropriate answer is A, B, D only.