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The key is frequently used within Freemasonry as representing "secrecy".
The oak branch represents (1) strength and (2) independence.
Normally, alpha is used to represent an angle. Just like "x" is used to represent an unknown number or angle, alpha, theta, beta are used to represent unkown angles.
Variable: A letter or symbol used to represent a number or quantities that vary
A pictograph is used to show picture values.