1D, 1-D, or 1d can refer to:
- Alpha-1D adrenergic receptor
- Astra 1D, a satellite
- Canon EOS-1D, Canon's first professional digital camera
- Long March 1D, a satellite
- One-dimensional space in physics and mathematics
- One Direction, an English-Irish boy band
- Penny (British pre-decimal coin), routinely abbreviated 1d.
1D, the hexadecimal code for the Group Separator control character
See also
Topics referred to by the same termThis disambiguation page lists articles associated with the same title formed as a letter–number combination.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: