1D

1D, 1-D, or 1d can refer to:

One-dimensional space in physics and mathematics Alpha-1D adrenergic receptor Astra 1D, a satellite Canon EOS-1D, Canon's first professional digital camera Long March 1D, a satellite 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

See also D1 (disambiguation) ID (disambiguation) LD (disambiguation)