also: もんじ
noun
Refers to individual symbols of a writing system, such as letters of an alphabet, kanji, kana, or other characters.
この文字は何と読みますか。
How do you read this character?
アルファベットは26文字です。
The alphabet has 26 letters.
noun
writing; written text
Refers to writing as a medium or to written content, often contrasted with speech or images.
文字で説明するのは難しい。
It's difficult to explain in writing.
彼は文字が読めない。
He can't read written text.