Ayuda does mean "help", but when calling for help, she'd probably be more likely to use the word "socorro". An upside down accent mark can also be made with Alt 173 (on the numeric keypad). Finally, I've heard Superman called "El Hombre de Acero" (The Man of Steel) in Spanish, although you wouldn't use the "El" when addressing him directly:
"¡Socorro, Hombre de Acero!"
"Hold on, my friends, to the Constitution and to the Republic for which it stands. Miracles do not cluster and what has happened once in 6,000 years, may not happen again. Hold on to the Constitution" - Daniel Webster
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