∫ Integral ∮ Physical integral
In direct proportion to ...
multiplication
σ addition
∞ union
Cross point
⊥ Vertical
parallel
electric arc
circle
no less than
Not more than
Constant equality.
Integer symbol
Integral of closed graph
In direct proportion to ...
∏ Connected product is the abbreviation of multiplication of many things.
∑ is pronounced as "Sima" plus sign, which is the abbreviation of adding up many things.
∨ Take the maximum value, such as 4∨9=9.
∧ Take the smallest, such as 4∧9=4.
⊥ Vertical means that two straight lines are vertical. For example, the straight line AB is perpendicular to the straight line CD, which can be written as AB⊥CD.
‖ Parallel, that is, two straight lines are parallel. For example, the straight line AB is parallel to the straight line CD, which can be written as AB‖CD.
⌒ pronounced as "arc", such as AB on a circle, can be written as adding that symbol to AB.
The representation of a circle, for example, the center of the circle is O, can be represented as O.
I'm not sure.