These abbreviations follow the same standard as those set forth by the Gossamer archives:
C - Crossover - Features major characters from other shows, movies or books, regardless of what type of story it is. Make a note about which show, book or movie is featured.
X - X-File - Plot-driven fiction centered around an investigation and/or conspiracy. Typical of an episode of the show.
T - Adventure - Plot-driven fiction not centered around an investigation and/or conspiracy. Not typical of an episode you would see on the show.
S - Story - Character-driven fiction that focuses on character interaction rather than plot. Any kind of interaction, not just romance! Friendship, family, and most romance stories fit into this category, as well pure erotica.
V - Vignette - Mood piece or a character thinking about something. There can be conversation, but there is little or no action and usually only one scene. Most vignettes are very short, but there is no size limit.
R - Romance - One or more main characters is romantically involved with anyone. If it's just an implied romance, don't classify it as a romance. Erotica doesn't have to be classified as romance though it can be, depending on the relationship.
H - Humor - Overall, the story is clearly meant to be funny.
A - Angst - For most or all of the story, main character(s) are in great emotional or physical pain.