Silгєncio Por Favor -

: Adding "por favor" (please) at the end—as in "Silêncio, por favor"—is considered more educated and respectful than direct commands.

: Signs in hospitals or waiting rooms often use this exact phrase to maintain a calm atmosphere. SilГЄncio por favor

Depending on where you are (Brazil vs. Portugal) and who you are speaking to, you might use different variations: How to say SILENCE PLEASE in SPANISH : Adding "por favor" (please) at the end—as