The most likely and interesting answer is that

The "F" designation is not part of Peugeot's standard naming system (which uses numbers like 208, 308, 508, with "1" for small cars, "2" for compacts, "8" for saloons/estates, and "9" for flagship sedans). So, what is F997?

First, the crucial clarification:

F997 Peugeot-------- -

The most likely and interesting answer is that

The "F" designation is not part of Peugeot's standard naming system (which uses numbers like 208, 308, 508, with "1" for small cars, "2" for compacts, "8" for saloons/estates, and "9" for flagship sedans). So, what is F997? F997 Peugeot--------

First, the crucial clarification: