A skateboard emoji, usually showing the board from the top.
Twitter's design shows the under-side of the board, as did a previous Microsoft design.
Emojipedia's sample image was modelled after Tony Hawk's skateboard.
Skateboard was approved as part of Unicode 11.0 in 2018 and added to Emoji 11.0 in 2018.
U+1F6F9
? Skateboard