noun
beautifully written character; beautiful handwriting
Colloquial term often used in the context of calligraphy practice or handwriting improvement, referring to aesthetically pleasing kanji or kana characters.
See also: 漢字
美文字を書けるようになりたい。
I want to be able to write beautiful characters.
この本は美文字の練習に役立つ。
This book is useful for practicing beautiful handwriting.
達筆 means skillful handwriting in general, often implying speed and fluency, whereas 美文字 specifically emphasizes visual beauty.
Compound of 美 (beautiful) and 文字 (character, letter). A modern colloquial coinage, not a classical term.