A matter-energy conversion matrix was a key component in matter-energy conversion technology used in replicators and transporters during the 24th century.

Realigning this matrix could convert a replicator into a small transporter with the capability to transport a small object a short distance. Doing so, according to Odo, required specialized training not commonly available.

Operatives of Klingon Intelligence, in 2371, did just that in order to transport a surveillance device with a high-energy laser into a panel on Deep Space 9. This device was discovered with the help of Miles O'Brien, who had time-traveled a few hours into the future and witnessed himself killed by the device. Due to this intervention, that event did not occur. (DS9: "Visionary")

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