plural of significant wave height

plural of signal aspect

plural of signalase

plural of signature strike

A military attack which is based on detecting suspicious activity rather than confirmed intelligence of terrorism.

a signal, which can vary in strength due to various factors, transmitted and received by radio by means of radio waves.

plural of signal strength

the (measured) strength of a radio signal as received by a radio or any other device receiving radio signals, such as a mobile phone.

An emergency signal sent by radio (or other means) from a ship or aircraft in distress or danger. / An indication of distress.

(historical) A kind of mechanical signal used on early American railroads, consisting of wooden balls, painted various colors, that were hoisted up and down a pole using a rope and pulley.