A : an act, celebration, or watchword that has been agreed on as the situation of concerted action b : a thing that incites to action Signal is created to never ever obtain or store any delicate information. Signal messages and phone calls can not be accessed by us or https://logcla.com/blogs/1184804/Signal-%E5%AE%89%E5%85%A8%E7%A7%81%E5%AF%86%E7%9A%84%E8%81%8A%E5%A4%A9%E5%88%A9%E5%99%A8