Geometry is the study of spatial structure and properties. It is one of the most basic research contents in mathematics, and the common theorems are Pythagorean Theorem, euler theorem Theorem and Stewart Theorem.

Common symbols are ⊥ (vertical), ∨ (parallel), ∞ (angle), ⌒ (arc) and ⊙ (circle).

2, algebraic symbols:

The research object of algebra is not only numbers, but various abstract structures. Among them, we only care about various relationships and their nature, but we don't care about the question "what is the number itself".

Common symbols are: ∧ (proportion), ∧ (logical sum), ∨ (logical OR), ∫ (integer), ≦ (inequality), ≤ (less than or equal to), ≥ (greater than or equal to), ≈ (approximately equal to) and ∞ (infinity).

3. Less than sign

It is an inequality operation symbol in mathematics. The British mathematician Harriet first used the symbol ""in his book Analysis of Practice, but it was not published until 163 1 year after his death.

4. Division number

It is a mathematical symbol, consisting of a short horizontal line and two points on both sides of the horizontal line. In mathematics, it is mainly used to represent division operation. Division can be applied to many fields such as mathematics, physics and chemistry.

5. Root number

This is a mathematical symbol. The root sign is a symbol used to represent the root operation of a number or an algebra.