Ok, I think I get it now.
Official designation shall be "Citroën G-Mini".
The idea was to create a compact car as innovative as the BMC Mini, which openly served as the inspiration, but with a much more advanced exterior appearance. The project was launched in 1964, first drawings were made in 1965 under the supervision of Robert Opron, before a full-size mock-up was constructed in 1968. At this point, the company management enthusiastically decided to launch the production of the car in 1971/72, and from then on the project was named "EN 101" (which can also be what you expect...). It quickly disappeared though, mostly due to the rejection of the EN 101's style by the public.