A single finger pointing upward, which could be used to represent the number one, or to ask a question.
Index Pointing Up was approved as part of Unicode 1.1 in 1993 under the name “White Up Pointing Index” and added to Emoji 1.0 in 2015.
☝️ Pointing Up
☝️ Index Finger Pointing Up
☝️ White Up Pointing Index
The White Up Pointing Index emoji supports skin tone modifiers. A yellow (or other non-human) skin tone should be shown by default, unless an emoji modifier is applied.
Platforms without support for emoji modifiers display a missing symbol character (box with a cross, alien, or question mark in it) next to any modified emoji.