A mark that was sometimes used in medieval manuscripts to show words or phrases that had been purposely omitted because, for example, they had been incorrectly copied by previous scribes.
The copyist showed this by placing a series of dots under the word was omitted.
An erroneous word blotted out and subpuncted.
1. For further info click here to read The Mysterious History of the Ellipsis, From Medieval Subpuncting to Irrational Numbers.