I took three photos on the trip.
Tシャツを三枚買った。
I bought three T-shirts.
アジを三枚におろしてから焼いた。
I filleted the horse mackerel into three pieces before grilling it.
三枚 counts exactly three flat objects like paper or plates, while 三つ is the general-purpose counter for three of anything regardless of shape.
comedian; comic actor · figure of fun; laughing stock
triptych
boneless rib; boned rib
triptych; three-panel set
three-piece filleting (of fish)
three-card betting game
Standard kanji spelling; high-frequency news word.
Numerical variant using Arabic numeral 3; common in practical contexts like lists or signs.
Compound of 三 (さん, 'three') and the counter 枚 (まい, 'flat object').