[Answer] What is the cap on a fire hydrant called?

Step 1 : Introduction to the question "What is the cap on a fire hydrant called?"

...Once referred to as a firecock, the modern term for a connecting point where firefighters can hook their hoses to a water supply is a fire hydrant. Europe and Asia have used underground hydrants since the 18th century. The 19th century ushered in the pillar-type hydrants that are above-ground. There are two types of hydrants: wet and dry barrel. A dry barrel is not filled with water until the valve is opened. This is the most popular type in the U.S. Wet barrel hydrants are filled with water at all times. The characteristic conical cap on the top of the hydrant is a bonnet. It secures the operating stem nut in the proper position while protecting the hydrant from mechanical and water damage. Source: MeyerFire.com

Step 2 : Answer to the question "What is the cap on a fire hydrant called?"

A bonnet:

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