The triangle is called delta. It means change. For example, a variable x might change over time. At the beginning of time, x would be x0, at some other point in time x might be xh. The distance between x0 and xh would be ∆x (delta x, or the change in x)
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If you mean the symbol of a triangle, in math and science a triangle stands for change in
It means "defined as."
The hazard lights.
If the triangle is made up of three bent arrows, then it is a recycling symbol which means that the object is made of HDPE: high density polyethylene.If the triangle is made up of three bent arrows, then it is a recycling symbol which means that the object is made of HDPE: high density polyethylene.If the triangle is made up of three bent arrows, then it is a recycling symbol which means that the object is made of HDPE: high density polyethylene.If the triangle is made up of three bent arrows, then it is a recycling symbol which means that the object is made of HDPE: high density polyethylene.
It is the number of degrees of that angle.