Umbrella
As a hat, four people holding a cross use an umbrella. The umbrella is big enough to be a hat for all four people, so it makes sense. All four of them are religious missionaries, so that’s why they’re holding the cross.
さん
かさ
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You know the Spanish phrase “Mi casa (かさ) es su casa”? Well this is kind of like that, but only with a hat. And that hat is an umbrella. Mi casa es yours too, because it’s an umbrella and also a hat. This makes sense, trust me.