Common internet message board phenomena

• Manuscript miscues
• Mis!is*ippi has two
• They can make good food and bitter butter
• Editors remove them
• Careless errors on a keyboard
• Proofer's finds
• Manuscript slips
• Errors like thsi
• Tihs clue has too of them

Wiktionary Word definitions in Wiktionary
n. (plural of typo English)