Trigger finger occurs due to inflammation of the tendons in the hand, causing hand tenderness, pain, and deformity. The condition limits your fingerâs movement and can make it impossible to straighten your finger.
1 A conical or volute spring (including the spring used to hold and make contact with the negative terminals of AA or AAA batteries in remote controls), and the vortex that is created when water is draining in a sink is often described as a spiral, or as a conic helix.
Battery charger. A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it. The charging protocol (how much voltage or current for how long, and what to do when charging is complete, for instance) depends on the size and type of the battery being charged.