We're talking about a version of GNU, the operating system, distinguished by having Linux as the kernel. A slash fits the situation because it means “combination.” (Think of “Input/Output”.) This system is the combination of GNU and Linux; hence, “GNU/Linux”.
There are other ways to express “combination”. If you think that a plus-sign is clearer, please use that. In French, a hyphen is clear: “GNU-Linux”. In Spanish, we sometimes say “GNU con Linux”.
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http://www.gnu.org/gnu/gnu-linux-faq.html#whyslash
We're talking about a version of GNU, the operating system, distinguished by having Linux as the kernel. A slash fits the situation because it means “combination.” (Think of “Input/Output”.) This system is the combination of GNU and Linux; hence, “GNU/Linux”.
There are other ways to express “combination”. If you think that a plus-sign is clearer, please use that. In French, a hyphen is clear: “GNU-Linux”. In Spanish, we sometimes say “GNU con Linux”.