(railways, transport) Initialism of European Train Control System (a signalling, control and train protection system, especially for high-speed lines.)

Initialism of electronic toll collection system.

And so on: used to note that the rest of a list or piece of information has been left out on the assumption that it is similar or already known.

Alternative form of etc.

(finance) Acronym of Exchange-Traded Commodity. / (wireless location) Acronym of Electronic Toll Collection (system to eliminate delays on toll roads by collecting them electronically)