The perfect password upgrade for chemistry nerds! H₃PO₄ (phosphoric acid) is labeled as "weak" because it's literally a weak acid that doesn't fully dissociate in solution. Meanwhile, H₂SO₄ (sulfuric acid) is labeled "strong" since it's a powerful acid that completely dissociates and can dissolve metals, organic materials, and probably your phone if you spilled it. Your IT department might want a special character, but chemists know the real strength is in those hydrogen ions!