If I'm showing code to someone, there's usually no need to pronounce the sigil at all (e.g. "friends has 2 elements"). I'd probably be more likely to say "scalar" and "array" for "$" and "@" in this situation. I might even call the variable by its value instead of by its name (e.g. "Then I 'draw' the circle." for $form->draw()).
If I'm dictating code, completeness and clarity is important, so I'd specify the symbols by name (e.g. "dollar friends equal 2 semicolon.").
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