The sound was left out to guard against the possibility that the messages contained signals for other terrorists.

Longer musical pieces are guided by a master drummer and contain embedded signals within the overall rhythm that indicate major changes in tempo.

The HQ company contains signals, quartermaster, catering, intelligence, administration, pay, training, operations and medical elements.

In fact, he added, "our surveys of builders in early May contained signals that things might slip back a bit in May."

The videos were shown by the FBI without sound, to guard against the possibility that the messages contained signals for other terrorists.

These complicated railway systems can also contain more than a thousand different signal systems, each containing different signals.

The relevant question is whether the Arab endorsements contain hopeful signals - and they seem to.

The flash shoe contained signals for X-sync, red-eye reduction and second curtain sync.

This Russian page contains signals which are probably the faster pulsations from Sputnik-2:

It came in two parts: the first containing universal and international signals, and the second British signals only.