Section of recorded data used to synchronise the data decoding electronics to the data stream. It occurs at the end of the data block.

a pattern of recorded data used to synchronize the data encoding electronics to the data stream ... it occurs at the end of the data block

A field of data that is sent after the data in a message. It is typically used to tag transactions from the bar code reader for rapid processing by the host, and it expands the data field (record) length. See also preamble.

a bunch of code usually found at the end of Camping apps which describes how the app is supposed to be executed

Optional ending words or phrase.