What does "ORM-D" mean?

ORM-D is an acronym for Other Regulated Material- Domestic for DOT shipping.  Until December 31, 2020 it will continue to mean:

Per the US 49 CFR

A material such as a Consumer commodity, Cartridges, small arms, Cartridges, power devices (used to project fastening devices), Cartridges for tools, blank, and Cases, cartridge, empty with primer, which, although otherwise subject to the regulations of this subchapter, presents a limited hazard during transportation due to its form, quantity and packaging. The article or substance must be a material for which exceptions are provided in Column (8A) of the §172.101 Hazardous Materials Table.

After December 31, 2020 ORM-D will no longer be used, and DOT shippers will be required to switch over to the Limited Quantity (diamond shaped label with black shaded on top and bottom).

January 1, 2021 is the mandatory compliance date for ground shipment, but many ground shippers have voluntarily switched over the LTD. QTY label in preparation for the coming change.