Scribing (graffiti) Wikipedia
Scribing is a style or method of graffiti in which a scribe is used to tag on glass surfaces. There are two popular types of scribes. The first is the arrowhead scribe, held between the thumb and index finger, used for quick connectible-style tags on glass. The second is the pen scribe, usually used for more detailed tagging. Scribing can be loud, especially when doing connectibles on glass.