#install gucharmap - This will show you characters and allow you to copy them
#or you can just Google them
sudo apt install gucharmap

echo "☠☯♞❤"
echo "♚♛♜♝♞♟"
or
echo -e "\u265a\u265b\u265c\u265d\u265e\u265f"
or
for u in {a..f};do echo -ne "\u265$u";done