A simple trick to decorate Theorem-like environments with poker suits QED symbols.
I did not come up with this theorem decoration style (I've first seen it here) nor with the whole code (I salvaged it from TeX StackExchange and other sources over the years). This is just my current implementation of the code.
This example shows how you can write in Korean (Hangul) characters in LaTeX with the CJK package, and particularly the CJKutf8 style. The CJK package is a modern alternative to the older HLaTeX (and hangul.sty) packages, with support for pdflatex and unicode.