D54 is an analogue lighting communications protocol used to control stage lighting.
D54 is a state road in the northern Dalmatia region of Croatia that branches off from D8 state road, facilitating access to Obrovac and D27 state road which in turn facilitates bypassing both Maslenica bridges.
The Dubai route numbering system is a network of highways and roads in Dubai, United Arab Emirates that is managed by the Roads and Transport Authority (RTA).
Leon (D54) (Α/Τ Λέων, "Lion") was a destroyer that served with the Greek Navy between 1951–1992.
INS Ranvir is the fourth of the five s built for the Indian Navy.