How to differentiate all the graduations in a ruler?

In the ruler below, there are some graduations on the ruler. I wonder how you can differentiate them in English. Specifically,

• The entire ruler

• The bigger part (`0`, `1`, `2`, etc... graduation itself, not number)

• The medium part (`0.5`, `1.5`, `2.5`, etc...)

• The smaller part (`0.1`, `0.2`, `0.3`, etc...)

• The number attached on the bigger part

I think the entire ruler should be just described as `ruler`, but how can I tell the graduations and its number attached on them?

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I can't say that I know the correct way to call them, but intuitively, I would call them: centimeter marks, half-centimeter marks, and millimeter marks. – Damkerng T. Mar 4 at 10:55
The marks are known as "tick marks", but as far as I know, they don't have specific names; if such terms do exist, they are recondite terms, not words the average native speaker knows. – TRomano Mar 4 at 10:58
In the US, metric rulers have only recently starting appearing on retail shelves. The man in the street still uses inches, not centimeters; the typical ruler might have tick marks at inch, half-inch, quarter-inch, eighth-inch, and sixteenth-inch. – TRomano Mar 4 at 11:07
Thanks guys. Maybe I should have clarified, but I want to add them the specific, intuitive names because they are properties defined in a class in my app (forgive me for using the technical jargons). – Blaszard Mar 4 at 11:07

I would say:

• The entire ruler can be called the ruler (or the rule, although ruler is more common)
• What you call "the graduation" could be called the units
• What you call "the smaller part" could be called the subunits
• The lines could be called the markings or the marks
• What you call "the medium parts" are known as center markings

Thus, I could describe the ruler in your picture by saying:

The ruler has centimeter units with millimeter markings, and center markings at the half centimeter.

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There are woodworking rulers (imperial measure) that go down to the 64th. – TRomano Mar 4 at 11:03
@TRomano - I realize my answer doesn't cover all marks on all rules. Your answer provides good supplemental information; thanks for covering that aspect of it. – J.R. Mar 4 at 11:19
I realize you realize. The terminology of your answer is general enough to cover all rules. – TRomano Mar 4 at 11:23

On Java sliders, the markings are referred to a major or minor ticks: you could refer to the big marks as numbered marks and the smaller ones as major and minor ticks.

``````The ruler has number markings every centimetre, with major ticks
every 5mm and minor ticks every 1mm.
``````

Microscopists used the terms coarse and fine: you could use medium to describe something between the two:

``````The ruler has numbered coarse graduations every centimetre,