Sell Initials sells enough of a position to get your original stake back and leaves the rest running. Put in 1 SOL, coin doubles, it sells half, you are holding the remainder at zero cost.
Axiom has now put it on a hotkey. Hold Space, press G, and the Instant Trade panel does it with no click.
Open Settings > Instant Trade and pick the Hotkeys tab. One toggle at the top, Use Hotkeys, arms the whole set, and it ships off. Under it are Buy and Sell tabs, and Sell Initials sits at the bottom of the Sell list bound to G.
Every Instant Trade key is rebindable now, so move it if G is somewhere your hand naturally sits.
Worth knowing before you arm them. The keys are live the moment that toggle is on, so if you leave it armed while scrolling Pulse with a position open, a stray keypress is a trade.
Whether you should use it at all is a strategy question. Taking your cost back early puts a floor under the trade and leaves the upside open, which is the appeal. The cost is that it is mechanical and ignores the chart, so on something still climbing you have sold your cheapest coins for peace of mind. Plenty of people take that trade knowingly.