I am applying for a job, and I don’t know what this question means?

First of all, don’t panic and don’t lie. Of course, it won’t sound good that you don’t know the answer but it is much better to confess than to lie. Sometimes the interviewee may deliberately prepare such questions which are impossible to answer just to look at your reaction. The best solution is to be honest and tell that you don’t understand the question, you don’t know the answer, and you will look it up as soon as possible. Anyway, the truth is the best option.