The tag 'icy worlds' on WindowsForum.com covers discussions about frozen celestial bodies, with a focus on Titan as a notable example. Content under this tag explores the characteristics of icy worlds, such as their frozen surfaces and potential for harboring unique environments. The tag is used in threads like 'Titan - A Frozen Oasis | The Lesser Worlds,' which presents Titan as a key subject within this category. Discussions may touch on scientific aspects of these distant, cold worlds, but the tag remains specific to the theme of icy planetary bodies rather than broader space topics.