“Tile / Gram” in Japanese is 瓦, read ga, kawara, guramu (が, かわら, ぐらむ). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 瓦屋根 (tiled roof).
What does 瓦 mean?