iOS 11 bug prevents some users from typing the word "I"
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The strange bug causes the English first-person pronoun to appear as the letter "A", accompanied by a weird unicode character, when typed in a text field. The unicode character either appears as an unidentified "[?]" next to the letter "A", or as five horizontal bars stacked on top of each other, depending on the app that's being used.
According to MacRumors, Apple Support staff proposes a temporary workaround, which involves the "Text Replacement" setting. If you are affected by the bug, you can go to Settings > General > Keyboard > Text Replacement, and replace all uses of a capital "I" with a lowercase "i".
via MacRumors
Things that are NOT allowed: