U+205E Vertical Four Dots

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Obelism is the practice of annotating manuscripts with marks set in the margins. Modern obelisms are used by editors when proofreading a manuscript or typescript. 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. An obelos was placed by editors on the margins of manuscripts, especially in Homer, to indicate lines that may not have been written by Homer. The system was developed by Aristarchus and notably used later by Origen in his Hexapla. Origen marked spurious words with an opening obelos and a closing metobelos ("end of obelus").

There were many other such shorthand symbols, to indicate corrections, emendations, deletions, additions, and so on. Most used are the editorial coronis, the paragraphos, the forked paragraphos, the reversed forked paragraphos, the hypodiastole, the downwards ancora, the upwards ancora, and the dotted right-pointing angle, which is also known as the diple periestigmene. Loosely, all these symbols, and the act of annotation by means of them, are obelism.

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