A thumbtack (drawing pin), as used to pin documents on a bulletin (notice) board. Depicted at a 45° angle with its red, flat head to the upper right.
Often used as an icon for Pinterest or metaphorically pinning content online. Not to be confused with ? Round Pushpin, though their applications may overlap.
Pushpin was approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015.
U+1F4CC
? Pushpin