It's a mysterious signal; sometimes it doesn't happen at all.

At least this planet was not emitting torpedoes or mysterious signals, for once.

Sometimes, through a mysterious, mutual signal, the two of them call it a draw.

She is found to be sensitive to a mysterious signal coming from the depths of space.

The mysterious signal is heard over every channel throughout the base.

She gestured to the side, as if transmitting mysterious signals.

But then, as if some mysterious signal had passed between them, Ezana nodded his head gravely.

He found written orders, regarding the search for the source of the mysterious wireless signals.

The group quickly divided up to begin analyzing this mysterious signal.

Olmy's mysterious signal passed through the open link and down the Way.