Final answer:
Without additional context from the material or story related to the character named Miles, it is not possible to determine which item was named 'Lightning'. Context is needed as the name could be applied to a bicycle, skateboard, scooter, or dog in a story.
Step-by-step explanation:
The question "What did Miles leave outside that was later named 'Lightning'?" pertains to a specific context of a story or a reading passage where a character named Miles has left an object outside that gets named 'Lightning'. Without additional context from the story or material this question is derived from, it's not possible to provide an accurate answer to this question.
Should the question refer to a well-known literary work or a textbook, additional contextual information is essential to pinpoint the correct response among the options provided (a bicycle, a skateboard, a scooter, or a dog). Each of these items could potentially be personified or named in a story, so knowing the correct scenario is crucial to determine which item was left outside by Miles and later earned the nickname 'Lightning'.