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Celebrate a New Arrival... Belatedly

Join me in welcoming this "new" symbol to the mathematical world!

But, what does it mean? Make a guess before continuing to read....

I found this symbol in the British text series Spectrum Mathematics: Gold Year 7 (Cambridge University Press, 2001).

There, it is defined to mean "is close to" when comparing two values. The text does add that this symbol is equivalent to the symbol:

My first and remaining thought...Why? Isn't the latter "standard" symbol adequate?

The text does not call the symbol "new"...nor does it give any reason why the "new" symbol should even be used...but it is included in problem sets!

But wait....do a Google search for "approximation"...and read the Wikipedia article, especially the Unicode section. Now, I am even more confused...or perhaps it is confused!