There is no mathematical symbol that I know of which uses color. You may be referring to an organizational emblem, in which case this question has been placed in the wrong category.
It should be noted that '==' is the boolean equivalency operator in most programming languages - it returns true if and only if both sides are equal in value, else it returns false.
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They equal a minus and two +'s or two -'s equal a + :)
It means "defined as."
Not greater than or equal to.
Assuming you mean 'logarithm to the base 'e' ( natural logarithm. On the calculator its symbol is 'ln'. Hence ;ln 2 = 0.69314718....
there is no symbol for it.