A system of symbols used to represent special things is called

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A system of symbols used to represent special things is called –

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Angle

Degree

Notation

Shape

answer is C.

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Detailed Solution

Concept- Symbol is like a sign or mark or word basically it represents relationship between two variable or an operation between constants or any idea. So here, we will find that special thing which a system of symbols is used to represent.
We are given four options: Angle, Degree, Notation, and shape.
Angle – Angle is a kind of figure which is a meeting of common end points of two rays. The symbol of an angle is

. Unit of the angle is degree.
Degree – Degree is the measurement of angle or can say the unit of angle.
It is denoted by ${"mathml":"<math class="image_resized" style="width:28px;height:12px"><span style="font-family:$ in the power of angle.
Notation - Mathematical notation is the use of symbols to represent actions, unspecified quantities, relations, and other mathematical objects, and the assembly of these symbols into expressions and formulas.
For example -

Here,

Symbol of triangle (i.e., a notation)
Shape – A shape is an object's form or its boundary (external) , outline, or external surface.
Hence, the correct answer is option (3) .

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