What do these white on red words indicate on a London Heathrow taxiway chart? What do the words in white block capital letters over a red background denote on this aerodrome chart of LHR?
They are named holding points; this allows them to say things like "taxi to RABIT" rather than "taxiway Bravo, hold short of taxiway Charlie". This saves a lot of time for ground controllers at busy, complicated airports.