Symbol |
Symbol Name |
Meaning/Definition |
Example |

1) ∠ | Angle | formed by two rays | ∠ABC = 60^{o} |

2) ⊾ | Right angle | 90^{o} |
α = 90^{o} |

3) ≅ | Congruent to | Equivalence of geometric shapes and size | ΔABC ≅ ΔPQR |

4) ⊥ | Perpendicular | Perpendicular lines (90^{o} angle) |
PQ ⊥ PR |

5) Δ | Triangle | Triangle shape | ΔABC = ΔXYZ |

6) → | Ray | Line that start from point. | |

7) ^{o} |
Degree. | 1trun = 360^{o} |
α = 60^{o} |

8) π | pi constant | π= 3.141592654...is the ratio between the circumference and diameter of a circle. | d = 2 πr |

9) ∥ | Parallel | Parallel lines | AB ∥ PQ |

10) ∢ | Spherical angle | ∢ ABC = 30^{o} |

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