Supirre is a Sign enhancing the auditory perception of the user. Drawn on a solid surface, it allows the people near the Sign to hear sounds which would be normally inaudible due to the distance or background noise. As such, it is often used for eavesdropping.[1]
A modified variant of Supirre was invented by Warritt, a blind witcher of School of the Viper. Possible to cast not only at the surfaces but just in the air, it compensated the monster hunter's lack of sight by giving him the ability of echolocation.[2]