Class 2 signal
A class 2 signal was a type of communique used between starships in which the sending ship requested the surrender of the receiving ship.

After the  became surrounded in the Romulan Neutral Zone by three Romulan battle cruisers in 2268, Sub-Commander  of the Romulan flagship sent the Enterprise a class 2 signal, stating, "you will surrender immediately, or we will destroy you." ()

Following the 2269 disappearance of the  in the Delta Triangle, Kuri, the commander of one of her sister ships, sent a class 2 signal to the USS Enterprise demanding their surrender. ()

Communications technology
Classifications