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Why is the root symbol (the first 3 letters of the option symbol) sometimes different for the same underlying stock?

April 26, 2017different letters option stock symbol underlying

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Why is the root symbol (the first 3 letters of the option symbol) sometimes different for the same underlying stock?

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If an option has many different strike prices the first 3 letters may differ since there might not be enough letter combinations for each strike to begin with the same first 3 letters.