「」？
How do you spell "pretty"?
Literal
"pretty" [genitive-の] spelling [topic-は]?
An elliptical question with the predicate omitted — 綴りは何ですか would be the full version. Note the use of full-width Latin letters (ｐｒｅｔｔｙ) inside Japanese corner brackets — this is a visual convention in Japanese text where Latin characters are sometimes typeset at full width to match kana width, especially in older or typographically traditional contexts.