Images or animations depicting at least one character who isn't wearing any clothing at all. Do not tag if the character is wearing anything that can be considered clothing, such as socks or a hat.
Nudity does not have to be erotic in nature. The nude tag still applies if a character's genitals and/or nipples are not visible, and even if the character is drawn in a cartoonish manner and do not appear to have genitalia.
Decorations such as piercings and jewelry such as bracelets, rings, and necklaces do not count as "clothing". In addition, bondage does not count as clothing, to a point. If, for example, a character is completely naked except for cuffs around their wrists and ankles, and a ball gag stuffed into their mouth, then that still counts as nudity. An elaborate full-body rubber harness, on the other hand, counts as clothing even if the character's genitals (and/or breasts) are exposed.
Nudity is generally Questionable or higher, but non-sexualized cartoon or barbie doll nudity can be Safe.