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I have seen the "at symbol" on several occasions, used in connection with LaTeX macros, often as part of command names. Does this symbol have a special significance in LaTeX, or is it just a convenient special convention?

An example I found at this site is here, like this : 

begingroup\makeatletter\def\f@size{5}\check@mathfonts
$$abc+xyz=44$$\endgroup

If the question has been asked before, a hint or a pointer will be very welcome. Thanks!

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user35145
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    Tank you! I followed your link and found 4 good answers. What do we do now, should I remove the question – since it already exists – or should it be left as a kind of road-sign? – user35145 Nov 12 '14 at 18:42
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    Leave it as a road sign (nice analogy, BTW) :) – jub0bs Nov 12 '14 at 18:44

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