The Signal logo, used by the secure messaging service, in its full version consists of a graphic symbol and the word Signal placed next to it. The graphic symbol takes the form of a blue circular message bubble with a pointed tail, outlined on the outside by a dotted line. The word Signal is set in a straight sans-serif typeface with softly rounded shapes. The app icon is also used separately without the wordmark.
Signal grew out of projects by Open Whisper Systems in the field of private mobile communication. In 2014, the service was released for iPhone as an app for encrypted voice calls, and in 2015 secure messaging and secure calling were brought together in a single Android app under the name Signal, uniting the earlier TextSecure and RedPhone projects under one brand. In 2018, the Signal Foundation was created to support and develop the service. Today, Signal emphasizes that it operates as a nonprofit organization, does not run ads, does not use trackers, and is funded through grants and donations, while its open protocol is also used for end-to-end encryption in other services.
