Obelism

Obelism is the practice of annotating manuscripts with marks set in the margins.

Examples are "stet" (which is Latin for "Let it stand", used in this context to mean "disregard the previous mark") and "dele" (for "Delete").

The obelos symbol (see obelus) gets its name from the spit, or sharp end of a lance in ancient Greek.

These nine ancient Greek textual annotation symbols are also included in the supplemental punctuation list of ISO/IEC 10646 standard for character sets.

Unicode encodes the following: Some of these were also used in Ancient Greek punctuation as word dividers.