Three common curvature pincurls are flat, volume, and:

• A. Indentation
• B. Spiral
• C. Ripple
• D. Wave

Answer: (A)

Pincurl curvature describes the direction the hair is shaped when the curl is formed. The three common curvature styles—flat, volume, and indentation—define how the curl sits and lays once released.

Flat pincurls sit flat against the scalp, giving a smooth, even line. Volume pincurls are set with the base away from the scalp to lift and create fullness. Indentation pincurls create a concave, inward bend in the curl, producing a soft inward curve that helps shape the finished style with a gentle hollow or pressed-in look.

Among the options, indentation is the one that names this inward, concave curl. The others describe different curl characteristics (spiraling, rippling, or a broader wave pattern) that aren’t the specific curvature category being referred to here.