Strikethrough
Look up strikethrough or Appendix:Strikethrough in Wiktionary, the free dictionary.
Strikethrough, or strikeout, is a typographical presentation of words with a horizontal line through their middle. Less common alternative forms of strikethrough are an X or a forward slash typed over each letter.
In medieval manuscripts, where strikethrough appears as a red line over the otherwise black text, the purpose is to highlight the text, giving it emphasis. In modern texts, the purpose is the opposite; it indicates removed text. Contrary to censored or redacted texts, the words remain readable.