The activation button on the Fourteenth Doctor's sonic screwdriver. (WC: The Fourteenth Doctor's Sonic Screwdriver, PROSE: Super Sonic)
The activation button was a part of the Fourteenth Doctor's sonic screwdriver located on the coral handle. It had circular Gallifreyan embossed into it. (PROSE: Super Sonic [+]Paul Lang, Doctor Who The Official Annual 2024 (Penguin Group, 2023). Pages 36-37.)
