One D
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
Informal for Onedrive, a file hosting system operated by Microsoft
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