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.
The above signal is called stop signal, and the one to the left is restricting. Aspect - The aspect of a signal is the visual appearance of a lit signal, for instance, in the above photo, the signal is displaying a red. As shown to the left in a two head signal, you have a lunar over a red. Indication - The indication of a signal is the meaning of a signal.