The double-flash signature board comes from the game "Ark of Tomorrow" and has the same principle as the double-flash badge. Acrylic printing local Bai Mo, that is, acrylic paper. The double-flash signature board is padded with a layer of flash backing paper, and then displayed on all sides.

To sign, that is, to write one's name, especially to express agreement, recognition, responsibility or obligation. There are more interpretations of signature, such as digital signature, artistic signature and so on.