LGX stands for Lucent Connector Group and is often called Lucent Global X. It was originally Lucent Technologies standard for fiber optic adapter plates and enclosures but over time it became industry standard.

SHD stands for "Super High Density" and provides a more compact connector layout or footprint on the adapter panel. SHD chassis enclosures can only accept SHD adapter panels or MTP/MPO cassettes.

UHD stands for "Ultra High Density" and provides the most compact connector layout or footprint on the adapter panel. UHD enclosures or panels can only accept UHD adpater panels or cassettes.