Exactly what it does mean. Close to, Bordering on, Adjoining. They do not have to be vertically next to something to be adjacent.
Interesting, my sleep-deprived brain combined with the lack of a question mark in your response "Haha aren't they on 99% of keyboards" caused me to parse it as a statement, transposing "aren't" and "they" and giving it the complete opposite meaning.
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