Symbol, Mark
This is a "#" key, which is usually depicted as a "#" symbol in a rectangular background box. The emoji can be used not only to refer to the symbol of digital prefix, but also to represent the button on the dial of telephone or mobile phone.
Different platforms have adopted different design effects. Among the emojis of many platforms, there is a blue background frame with a square shape; The background frames displayed on OpenMoji, Softbank and au by KDDI platforms are gray, red and white respectively. As for the Docomo platform, two parallel black line segments are used instead. In addition, font design also varies from platform to platform. The "#" of individual platforms appears to be more formal, and the vertical lines and horizontal lines in the "#" remain perpendicular to each other; On some platforms, "#" is relatively personalized, and the vertical line of "#" is from top to bottom and inclined to the left.