Index finger pointing downward.
Just like all the other pointing emojis, this one is often used to indicate where to pay attention; for example, it may be used right above the?Link that one should follow or the video to⌚Watch to learn something important.
Also, it may mean direction in the truest sense of the word — in this sense, it may, for example, illustrate the message about neighbors in the apartment downstairs.
Backhand Index Pointing Down was approved as part of Unicode 6.0 in 2010 under the name “White Down Pointing Backhand Index” and added to Emoji 1.0 in 2015.
U+1F447
? White down pointing backhand index