Dog whistle

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A dog whistle emits a sound in a range that people can not hear but dogs can hear clearly. 

In the context of your resume, a dog whistle is a reference to a requirement not mentioned in the job description but critical to getting the job done effectively.

A dog whistle provides credibility.

Anyone can list the job description requirements on their resume. Just because you say you can do what's required doesn't tell the hiring manager how much you know. 

Providing an example of deep knowledge by mentioning something only an experienced person would know will send a strong message to the hiring manager. It will set you apart from other candidates.

The key to finding the dog whistle is finding a pain point.

If you know your craft well, you will know what the company is dealing with in detail beyond what's written in the job description.  Getting a job done usually involves issues and hurdles that will need to be overcome to be successful. They won't be mentioned in the job description.

For example, a concrete engineer would know that the mix for a cold weather application needs to be varied to account for freezing effects during the curing process. Most likely, the job description won't mention that level of detail so it would be  important to include reference to a cold weather project in your resume so it's clear that you know what you're doing.