HSK 7-9
枚
méi量
classifier for small objects: coins, badges, rings, carved seals, chess pieces, eggs, fingerprints etc (more formal than 个); classifier for bombs, missiles, satellites etc; (on product packaging) classifier for flat items (from Japanese 枚 "mai"); (old) stick used as a gag to prevent soldiers from talking while sneaking up on the enemy; surname Mei
工作人员发现了三枚旧硬币。
Gōngzuòrényuán fāxiàn le sānméi jiù yìngbì.
The staff found three old coins.
Say it
Hold the button, say it, then let go.
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.