It shows where to put something in the car, etc. (5)

I believe the answer is:

caret

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But I can't explain it at all! Could you help me understand?

(Other definitions for caret that I've seen before include "Indicator of omission" , "Proofreading sign for 'Insert'" , "Weeding tool" , "It shows what to put in" , "Proofreader's sign of omission" .)

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