It is used throughout the main stylesheet. Tiddly Core?
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There are several prefixes using by identifiers in the TWCore:
tc- = TiddlyWiki Class (for CSS classes)
tm- = TiddlyWiki Message
tv- = TiddlyWiki Variable
Early versions of TW5 used a general tw- prefix, but this was changed over 7 years ago (release 5.0.16-beta, 21st February 2015) to provide greater clarity of purpose for the individual identifiers.
In addition, in keeping with this naming convention, CSS classes defined by my TiddlyTools stuff uses a prefix of tt-. This allows me to avoid any overlap with existing or future TWCore CSS definitions as well as emphasizing that these classes are related to my TiddlyTools customizations.
-e
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It is useful to see this made plain!
It can help a lot of people who want to better understand the TW. 
TT
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