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notches; serration; indentation; jaggies (stair-step artifacts in computer images)
notched; serrated; jagged; corrugated; milled
「段々」 has another reading with different meanings.
ハサミの刃がぎざぎざだ。
The scissor blade is jagged.
紙の端がぎざぎざだ。
The edge of the paper is jagged.
この紙の端がぎざぎざで手を切りそうだ。
The edge of this paper is jagged and I might cut my hand.