A packet boat powered by steam.

plural of steam-packet

(military, slang, idiomatic) To be fired upon.

(computing) A data packet having every option set for whatever protocol is in use.

plural of Christmas tree packet

(mobile communication) A packet-oriented mobile data service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones. It provides data rates from 56 up to 114 kilobits per second.