© 2023 David Roesel, taken with Sony α6400 near Tongariro National Park
An explanation for my foreign friends: PF is an abbreviation of Pour Felicitér meaning (or at least meant to mean) "Happy new year!". Although the words are French, they are only used this way in Czech and Slovak for some reason. If French is too uncomfortable, which I understand, just imagine a Happy new year! sign.