The way I've interpreted this is it means experience in a particular industry or market segment so that when a product owner says they need a program to do "X" you know what "X" is without a lengthy explanation.
For example, if you created a retail inventory tracking application, you would have retail inventory industry experience. If you created an app for hotels, you would have hospitality industry experience.
There can be crossover industry experience as well. I got my current job because I not only had manufacturing industry experience but also experience in working with devices like scales, barcodes and PLCs, although that wasn't at a manufacturing company.
I have teaching experience. I actually got hired by a school governing body to teach 19 students IT. As much as I enjoyed the gig I don't think I enjoyed marking for the rest of my life. Although this was experience gained
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