Puzzled by 'Afagnal': What Does it Mean & How is it Spelled?

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im puzzled by a word read as 'afagnal'. if 2 vectors(H&T) are 'afagnor' to each other, <H|T>=0. i failed to google it out.How to spell this word presicely and what is the meaning? Is anybody can help?
 
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The word is orthogonal.
 
thank you very much!
 

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