It seems like you're looking for an icon that represents retention.

For this purpose, you can use the @expo/vector-icons package in Expo.

Here's a brief snippet to get you started:

import React from 'react';
import { MaterialIcons } from '@expo/vector-icons';

const App = () => {
  return (
    <MaterialIcons name="lock" size={24} color="#333" />
  );
};

This will display the lock icon, which can be used as a retention PNG or wallpaper.