“T'ang / China / Foreign” in Japanese is 唐, read tou, kara (とう, から). 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 唐辛子 (chili pepper).
What does 唐 mean?
Same sound, different character — the classic trap. Compare them side by side: