The U.S. export regulations identify controlled technology by publishing control lists:
In order to understand what export restrictions apply to your technology, you must first determine which regulation(s) may apply. This is called the “export classification” process. Once you determine the export classification for your technology, you can proceed to the next step of determining if an export license or authorization is needed prior to exporting your commodity outside the U.S., or sharing your technology with foreign nationals .
For more information and instructions for how to classify technology, see the FAQ.