Kästchen und Kätzchen.

In fact, some participants in the mailing list discussion proposed adding non-alphanumeric characters to future release names just to see what happens. Paul Flo Williams predicted someone proposing "Motörhead's Moshpit" as the Fedora 20 release name because of the non-ASCII characters, while Richard M. Jones suggested ☃ (the Unicode "snowman" character U+2603, also known as HTML character entity &9731; or ☃). Peter Robinson proposed the project go right for the goal and choose "DROP table *;".

Nathan Willis / Linux Weekly News

(Oh, and I wanted to put the real U+1F63B in here, but WordPress ...)