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As far as I'm concerned "printable characters" are the set of characters that occupies a printing position on a display. You can print a subset of (not all) printable characters by executing :echo &isprint.

:echo &isprint
@,161-255

The speciications present in vim documentation are concise. According to :h 'isprint', characters from space (decimal value: 32) to tilde (decimal value: 126) are considered as printable characters, even they are not included in 'isprint' or excluded. This raises the following question: why is the at sign (@) explicitly specified within the set of characters that is displayed by executing :h 'isprint' while the other characters are represented by a range of decimal values. Does this implies something significant? Is the at sign considered as something more than a simple character?

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    as you say the specifications are concise: as documented at :help isfname, @ stands for all "alphabetic characters," the meaning of which is locale-dependent.
    – Mass
    Nov 1 '19 at 0:05

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