| Symbol | Meaning | In Words |
|---|---|---|
| ꓕ | Perpendicular | Perpendicular lines. |
| ∆ | Triangle | Triangular shape |
| ⁰ | Degree | A full rotation is 360 degree. |
| ∟ | Right angle | Angle is 90 degree. |
| ∥ | Parallel | Two lines are parallel. |
| π | Pie | Constant with value of 3.141592654... |
| rad | Radian | 360? = 2? rad |
| ≅ | Congruent | Geometric shapes and size are equal. |
| ~ | Similar | Same shape with different size. |
| ∠ | Angle | Formed two lines. |
| ∴ | Therefore | Therefore |
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