Activation button
From Tardis Wiki, the free Doctor Who reference
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 [+]Loading...{"page":"36-37","1":"Super Sonic (feature)"})
