The term "Lancer security bot v3.0" is conjectural. The real name is unknown, and a non-canonical nickname or title is used instead. See the reasons for this title in the "Behind the scenes" section below and/or the relevant discussion on the talk page, if there are any.
Lancer security bot v3.0s were a type of security bot which fired a Lancer bullet to attack. They had stronger attacks and even more armor than the v2.0 security bots.