Type to Siri. When you don’t want to speak out loud, you can type to Siri—for example, when you’re in a quiet place like a meeting or a library. To type to Siri, double-tap the bottom of the screen, then enter your request. To turn off Type to Siri, go to Settings > Apple Intelligence & Siri, tap Talk & Type to Siri, then turn off Type to ... More @Wikipedia
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