七
qī · HSK 1
seven
7️⃣ qī sounds like 'chee' — say 'cheese' for a count to seven
七 is the digit seven. The horizontal stroke with a curving hook is the standard shape; not a decomposition of other characters. Mandarin qī rhymes with English 'chee'.
七 — single horizontal stroke 一 + vertical hook 乚
Originally a pictograph showing a horizontal line cut by a vertical stroke, representing the act of cutting — the early meaning of 'cut' (later written 切). It was borrowed phonetically to write the number seven, and that borrowed numerical meaning became standard, while the original 'cut' sense moved to 切.