A red solid colored triangle with its tip pointing down. Because of its shape, looks like the down arrow for lifts. Can also be used to indicate that you are going to pay special attention to what you are going to send next.
The Red Triangle Pointed Down emoji may be used as another version of an arrow pointing down. It can be used to point attention to the content below.
This emoji is also similar to the button that turns down the volume.
A red inverted triangle was used in the 1930s at Nazi concentration camps. The upside-down red triangle was used to identify political prisoners.
On 18 June 2020 Facebook removes Trump ads displaying red triangle emoji as it violated its policies on "organized hate" and were "banned hate group's symbol."