|Link to The Independent|
"It's the dots that do it, on the 'i's'. Except that they're not dots at all, but diamonds. The adornments on an otherwise beautifully simple typeface are an identifying quirk of Johnston Sans, a font that is as synonymous with London as Big Ben. It has become known as the 'handwriting' of the city, but can you identify it? Did you even know its name?
"Antony Harrington is obsessed with type. It is partly the job of successful fonts to be invisible and as such they are usually overlooked. Johnston Sans, as it happens, is the font of London Underground."