cacography

Bad spelling or punctuation, especially unintuitive spellings considered as a feature of a whole language or dialect.

A phrase exhibits proofs of cacography, when the accents are misplaced, forgotten, or used erroneously.

In 1997, two American entrepreneurs, Robert Hoffer and Timothy Kay, formed a company called Typo.net to try to profit from Web surfers' cacography.

Deliberate comic misspelling; malapropism.

The soul of dialect is cacography, the deliberate misspelling of words for comic effect, which is the written equivalent of the malapropism.

Poor or illegible handwriting.

Many illegible letters is the sign of disorder, and the illegibility of Greeley's cacography has furnished numberless anecdotes.

Germans write a "1" so it's easy to confuse it with a "7": mathematics and cacography can leave Margret and I not speaking to each other for a week.