Sovereign
You stand your towel up so everyone can see it. This announces that you are the sovereign ruler of this bathroom.
Whenever someone walks into your bathroom, you start screaming that you are the sovereign ruler of this toilet, this sink, this toothbrush, and all that touch these tiles.
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みかど
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As the sovereign ruler of this bathroom, you must choose a monogram to represent your rule. For this, you choose the symbol of the food that passes through you the most: The mighty tater (てい) tot!
Picture your standing towel with a huge tater tot sewn into it. Everyone who sees this will know that you're the toilet tater tot sovereign.