1D

Look up 1D, 1-D, or 1d in Wiktionary, the free dictionary.

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