What was O'Ren Ishii's code name as a former member of the Deadly Viper Assassination Squad in the film "Kill Bill Volume 1"?

Lucy Liu is the character named O-Ren Ishii in the 2003 film "Kill Bill Volume 1". Her code name is Cottonmouth; she is a former Deadly Viper from the Deadly Viper Assassination Squad. She will become the leader of the Japanese organized 'Yakuza Crime Group'. She and Bill's Bride (Uma Thurman) once had a close friendship. She is now the Bride's first target on a critical hit list.

As their name suggests, the Deadly Viper Assassination Squad was an assassin squad that was organised and operated by Bill (Snake Charmer). David Carradine is Bill during a time he is known to have been carrying on a romance with his protégée, Beatrix Kiddo called Black Mamba, whom he eventually impregnates just prior to her running away and going into complete hiding. She gets some information which makes her think that bad things are about to happen to her.

In this American martial arts film written and directed by Quentin Tarantino, the Bride (Kiddo) swears and wants to have revenge on a team of assassins (Lucy Liu - Cottonmouth, Michael Madsen - Sidewinder, Daryl Hannah - California Mountain Snake, and Vivica A. Fox - Copperhead) and their leader/her ex-boyfriend, Bill (Carradine). Kiddo needs to take action against them because they try to kill her and her unborn child. Her journey takes her to Japan, where she will battle the Tokyo yakuza.