کلاه از سر برداشتن ( به معانی احترام ) :معمولا نویسنده برای کسانی که در نوشتن یک کتاب به وی کمک کرده اند می آورد.
Wikipedia:A hat tip is an act of tipping or ( especially in British English ) doffing one's hat as a cultural expression of recognition, respect, gratitude, or simple salutation and acknowledgement between two persons.
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Google define: ( in online contexts ) used as an acknowledgement that someone has brought a piece of information to the writer's attention, or provided the inspiration for a piece of writing.
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