An ergonomically designed training tool to be held between both palms and operated by all ten digits. The device is printed with the twenty six letters of the alphabet, which are spaced around its surface in such a way that each finger is within reach of two letters, and each thumb four.

With practice, words can be spelled out on the device at speed using a minimal set of gestures, and once letter positions are familiar the interlocutor can dispense with the training tool and enunciate in the air without it. The gestures of spelling – forward and backward movements of the fingers; forward, backward, left and right movements of the thumbs – are differentiated from ordinary everyday gesticulations by the steady distance maintained between the two palms, which recalls the width of the original tool.

With the palms held in place there lacks only interpretation and response from an equally practised second interlocutor.