Indirect ways of assessing past temperatures, using so-called temperature proxies, take measurements of responses to past temperature change that are preserved in natural archives such as ice, rocks and fossils.
Wikipedia has an article on: Reorder tone. Wikipedia. fast busy signal â(plural fast busy signals) (telephony) An audible signal on a voice phone line that sounds more frequently than a standard busy singal, indicating that no transmission path to the called phone number is available.
This red traffic light is a signal to stop. Signal means out of the ordinary or remarkable. An example of signal used as an adjective is the phrase a signal win which means a team that usually loses has just won. The definition of a signal is a message or means of communicating a message. An example of a signal is a red light.