This is not a new concept: Braille users type out Braille (mechanically or digitally) with Perkins-style 6 or 8-key (in reference to the Braille dots being enc

This is not a new concept: Braille users type out Braille (mechanically or digitally) with Perkins-style 6 or 8-key (in reference to the Braille dots being encoded) keyboards, only using chords, which are known as Braille chords. These Perkins-style keyboards, which are also colloquially referred to as Braille keyboards, are often integrated into refreshable Braille displays (and are sometimes standalone devices that are known as Braille notetakers, which also allow one to utilize various Braille codes better), which is how one reads digital material. Not only can these keyboards (and chords) be used to type, they are used to navigate, via screen reader, mobile and physical computer terminals, along with other interfaces. When it comes to typing out something in math code, for example, Braille users have the ultimate advantage over anyone who uses LaTeX/MathML, if they know which Braille code to learn. Right now, that Braille code is currently Lambda. They can type out, for example, infty, with a single Braille chord, if they know what they are doing. Such codes also allow for the spatial encoding of the integral sign and its components, in a linear manner, along with the back-translating of that into how it should be displayed visually to a sighted person. But, if one learned Braille as an adult, they tend to prefer to at least keep a standard Bluetooth keyboard around to type in QWERTY/QWERTZ. They cannot help falling back on it from time to time. The people who learned Braille in school as a young child tend to prefer Braille chords over standard keyboards, even for standard typing. It can help prevent typing errors too, so it is a very useful skill to have. One can practice these chords on the vast majority of standard keyboards, including on laptops. But, there are also a couple of Braille Bluetooth keyboards that are being sold, but they are typically overpriced for what they are.