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(表示方位的)標記，路標，記號;（起提示作用的）標示物
A marker is an object which is used to show the position of something, or is used to help someone remember something.
例句
He put a marker in his book and followed her out.
他在書里夾了一個書簽后便隨她出去了。
...lines of weathered stone markers sticking up from the desert.
矗立在沙漠里的一排排飽經風吹日曬的石頭路標
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（品質或特點的）標志，代表
If you refer to something as a marker for a particular quality or feature, you mean that it demonstrates the existence or presence of that quality or feature.
例句
Vitamin C is a good marker for the presence of other vitamins and nutrients in frozen food.
維生素C的存在是冷凍食品里存在其他維生素和營養成分的很好說明。
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記號筆，氈筆(筆頭較粗，由氈毛制成，用于繪畫和著色)
A marker or a marker pen is a pen with a thick tip made of felt, which is used for drawing and for colouring things.
例句
Draw your child's outline with a heavy black marker.
用濃黑色的氈筆畫出你孩子的輪廓。