Gyō

Gyō (凝) is a technique where a Nen-user concentrates a larger than normal portion of their aura into one specific body part. This ability to concentrate the aura is known as Gyō. Gyō increases the strength of that one body part, but leaves the rest of your body more vulnerable.

Gyō is most often used on the eyes, which allows a Nen-user to see things which would otherwise be hidden (e.g. nen objects hidden by In). This also allows a Nen-user to analyze an opponent to find weaknesses that would otherwise be unnoticeable.