Regardless of FP400 being a Prysmian trademark or not, it is the passing the test, with a certified national research testing lab (NRTL) result for cable test BS-5839-1 and BS-5266-1 that merits these cables as fire resistant.
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"Don't disturb my circles." translation of Archimedes last words
Similarly, some people refer to "Belden" cables in the same way that "Hoover" refers to a brand of vacuum cleaner (not an endorsement - other brands of cables and vacuum cleaners are available).
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856