These nouns denote bright light, especially when it is a visible sign of combustion. 這些名詞意指強烈的光，尤指燃燒時的可見信號。
It may also act as a visual signal of adulthood, along with growing breasts and widening hips in girls and deeper chests and beards in boys. 隨著女孩乳房的日益增大和臀部的加寬以及男孩胸部的加深和鬍鬚的長出，陰毛也可能作為成年人的一種視覺信號。
Meanwhile, a Blind Spot Information System registers if another vehicle is in the offset rear blind spot alongside the car and alerts the driver via a visual signal. 與此同時，一個盲點信息系統登記，如果另一輛車是在後方的盲點抵消一起汽車，並提醒司機通過視覺信號。
