“shape / form” in Japanese is 形, read kei, gyou, katachi (けい, ぎょう, かたち). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 形 (shape).
What does 形 mean?
まるい形の いし。
Same sound, different character — the classic trap. Compare them side by side: