What idiom is a finger spider web, a computer and a question mark?

A finger spider web, a computer and a question mark are clues.

Clue means that the spider can be found from the spider silk hanging down, and the horse's whereabouts can be found from the mark of the horseshoe; It is a metaphor for the traces and clues left by things.

Idioms are a major feature of China's traditional culture. They have a fixed structural form and a fixed statement, indicating a certain meaning. They are used as a whole in sentences, and bear the components such as subject, object and attribute.