The discussion centers around identifying a specific type of tray used in laboratory settings for conducting antibiotic investigations. Participants suggest that the tray might be an "ELISA test plate," although there is some uncertainty about the exact terminology. One user mentions using trays from Atlantic Nuclear Corp., designed for assays with radiolabeled substances, which feature a clear disposable liner for spill containment and easy clean-up. Ultimately, the original poster concludes that they simply referred to it as a "white tray," expressing gratitude for the assistance in clarifying the terminology.