General terms:
* Graduation: This is a very common and general term for a mark on a measuring instrument.
* Mark: This is another general term that can be used, but it may be less specific.
* Division: This is often used for the space between two graduations.
* Index: This refers to a specific mark or point on a scale, often used as a reference point.
Specific terms:
* Tick: This is an informal term often used for small graduations.
* Line: This can be used for any type of mark, especially on a linear scale.
* Number: This is used when the scale has numbers indicating the values.
* Pointer: This refers to a movable indicator on the scale, like the hand on a clock.
Contextual examples:
* Thermometer: The thermometer has graduations in degrees Celsius.
* Ruler: The ruler has ticks every millimeter.
* Weighing scale: The index on the weighing scale points to the weight of the object.
The best word to use will depend on the specific instrument and the level of formality required.