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I am not of the younger folks but I seem to remember that one might represent a 3/2D rotation with a vector adorned with such an arrow.
In which the vector axis is the rotation axis and the length / norm is the angle of rotation...
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From what I have learned, anti-clockwise moment is indicated with that symbol (along with a '+' or '-' sign). But that's Mechanics (Statics) and I don't recollect anything with that symbol in Algebra.
I ain't got no signature.
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PIEBALDconsult wrote: ...and the kid doesn't seem to know.
Nor the teacher?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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He (the kid) was out with a fever for two days.
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DavidCrow wrote: Nor the teacher?
I thought the same thing. Why not go to the teacher first. 
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There should be some explanation at the first point in the book where it is introduced. Or, is there some kind of glossary in the back of the book?
<sig notetoself="think of a better signature">
<first>Jim</first> <last>Meadors</last>
</sig>
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So I would think, but they weren't issued books. 
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Crazy. That's probably why QA has so many requests to do homework. 
<sig notetoself="think of a better signature">
<first>Jim</first> <last>Meadors</last>
</sig>
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A math class.
With no books.
Western civilization is doomed.
With any luck, the teacher will be mounted to the front of the savages' leader's vehicle when they storm the refuge of the survivors...
Software Zen: delete this;
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Apparently the books are supposed to stay in the room.
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I stand by my original response.
Software Zen: delete this;
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Guess where the knowledge will likely stay. Effing school boards, I'll bet the Supervisor makes a great deal of money, while "saving" so much on the education of children.
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Gary Wheeler wrote: A math class. With no books. Western civilization is doomed.
Soooo right. It's a nightmare, with hastily bodged-together curriculum with no backup at all. Makes me crazy, and my kid's just in elementary school.
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I haven't searched, but you could try looking for it in Latex and seeing if that offers any clues via name/documentation etc.
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My wife and I both searched. Even Wolfram seemed to just shrug.
We wouldn't be surprised to find that it's the wrong symbol. Or some cockamamie new "common core"  thing.
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My guess, based on the context of the formula, would be that it means "simplify". Now, if your child is in a graduate course on non-associative algebra, the answer may be different.
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Sure it's not a printing error? A multiplication sign that is messed up? That would make the most sense to me at least.
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This is in line with my thinking. I've seen multiplication represented by an 'X', an '*' (asterisk), a dot, and an open dot (circle). Maybe they were going for a dot or open dot, but the character set the printer used didn't have an exact match. The anti-clockwise arrow may have been the best fit. (Why they didn't replace it with a common alternative like 'X' or '*' is anyone's guess...)
Of course then you have to ask what business the printer has printing math books without a sufficient character set... But that's another conversation entirely...
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Have not found it anywhere though have tried even image search, definitely not standard math symbol. Its either printing error or an individual attempt to map a shaky concept into self created image.
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Read();
Research();
Experiment();
UnTil You Inspire!
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Never seen it either, but it might be an indication of an iteration of some kind?
ask teacher 
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I graduated math but I 've never seen this symbol. Maybe it is Operation defined before question.
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The rational exponents can only simplified if the symbol is a division. If you multiply 12/5 * 3/5 you get 36/25 which cannot be simplified. The other way around 12/5 / 3/5 = 4 makes a lot more sense. Same for the other expression.
Josef Schroettle
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Except that a multiplication symbol there would mean you add the exponents together, not that you multiply them.
For example: c^2 x c^3 equals c^5, not c^6.
Therefore, if it is multiplication, you will actually be doing: 12/5 + 3/5 which is 15/5 which simplifies to 3.
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I thought when you multiplied the same variable with two different exponents together, you just add the exponents. So..
c^(12/5) * c ^(3/5) ==> c^(12/5 + 3/5) ==> c^(15/5) ==> c^3
x^(3/4) * x^(9/2) ==> x^(21/4), or x^(5 1/4
Looks to me like the counter-clockwise arrow is a typo -- meant to be a dot for multiplication, but they used the wrong glyph, and the proof reading quality control these days is left as an exercise for the student.
We can program with only 1's, but if all you've got are zeros, you've got nothing.
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