Sign - a elementary linguistic device linking a signifier to that which can be signified; "The bond amongst the signifier as well as signified is arbitrary"--de Saussure OLED stands for natural and organic gentle-emitting diode. As opposed to other LEDs we’ve discussed thus far, OLED is often a conductive sheet https://geschaftmega.de/die-emotionale-und-psychologische-wirkung-von-leuchtreklamen/