In Hinduism, geometric symbols play a significant role in representing various principles and deities. The symbols you've provided appear to be associated with the male principle, often related to Shiva, and are used in yantras and tantrism. Here's a brief explanation of each:
Triangle: This symbolizes the male principle, often associated with Shiva. It represents energy, direction, and focus.
Arrowhead: This can also be a representation of the male principle, denoting direction, power, and movement. It is often used in yantras to channel energy.
Curved Line: This could symbolize various things depending on context, but in some interpretations, it represents the flowing, dynamic energy often associated with Shakti, the female principle. However, its precise meaning can vary.
These symbols are integral to the construction and interpretation of yantras, which are geometric diagrams used in meditation and rituals to invoke deities and channel spiritual energy.