Standard Galactic Alphabet
The Standard Galactic Alphabet, also known as SGA, is the writing system used to depict Omnispeak, the alien language of choice in the galaxy in the Commander Keen fictional universe. The player usually first discovers the alphabet in the first Commander Keen game, Marooned on Mars, where Keen telepathically hears an alien inside a shrine say: "It is too bad you cannot understand the Standard Galactic Alphabet, human".
In reality, it is a simple substitution cipher created by Tom Hall for the Commander Keen series. Originally for Keen 1 he drew some graphics for Exit signs which he made look a bit more alien by changing the ordinary Latin letters a bit. After that he added other signs saying "hi" and "this is neat" (near rayguns), and he ended up creating conversions for the other letters of the Latin alphabet for the signs to resemble writings in an alien language. Because the texts are still in English, however, it is not an artificial script.
Besides the 26 letters, SGA uses spaces for its interword separation, and in some instances uses a ·—· symbol as a full stop. In the Keen 1 level in which most players obtain the pogo stick, a short horizontal dash above a long one appears on either side of the word "POGO", perhaps as quotation marks. No other known punctuation exists. There is also no capitalization, and numbers are absent.
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