Here are the descriptions of Central and Eastern European letters that are not lost in the forum.
A with ogonek is used in Polish and Kashubian languages.
C with acute is used in Polish language.
C with caron is used in Czech, Slovak, Slovenian etc.
E with ogonek is used in Polish language.
E with caron is used in Czech and Sorbian languages.
L with stroke is used in Polish and Kashubian language; but it is in Windows Korean codepage.
N with acute is used in Polish only.
N with caron is used in Czech and Slovak only.
O with double acute is used in Hungarian only.
It thinks that not all Central and Eastern European characters are included in your reply.