There is a legally important distinction, which you may encounter in statutory language where a codified law states "As defined in this title", "notwithstanding contrary provisions in this chapter", "as defined in this subsection". Ultimately, one has to look at the law as passed. For example, this bill refers to "Section 1. Section 16-332, Arizona Revised Statutes", and contains things labeled A and B. This bill refers to Section 1. Title 1, chapter 2, article 4, Arizona Revised Statutes and makes an amendment by adding section 1-273.
This bill is much bigger. We learn from the language that there are subsections C, H, etc. and when Subsection G says "may extend the time period provided in this subsection", we can infer what the scope of "subsection" is (it's the stuff labeled with capital letters). ARS 13-105 (the codified law, not the enacted bill) states
- "Culpable mental state" means intentionally, knowingly, recklessly or with criminal negligence as those terms are defined in this
paragraph:
which is then followed by
(a) "Intentionally" or "with the intent to" means, with respect to a
result or to conduct described by a statute defining an offense, that
a person's objective is to cause that result or to engage in that
conduct.
(b) "Knowingly" means, with respect to conduct or to a circumstance
described by a statute defining an offense, that a person is aware or
believes that the person's conduct is of that nature or that the
circumstance exists. It does not require any knowledge of the
unlawfulness of the act or omission.
(c) "Recklessly" means, with respect to a result or to a circumstance
described by a statute defining an offense, that a person is aware of
and consciously disregards a substantial and unjustifiable risk that
the result will occur or that the circumstance exists. The risk must
be of such nature and degree that disregard of such risk constitutes a
gross deviation from the standard of conduct that a reasonable person
would observe in the situation. A person who creates such a risk but
who is unaware of such risk solely by reason of voluntary intoxication
also acts recklessly with respect to such risk.
(d) "Criminal negligence" means, with respect to a result or to a
circumstance described by a statute defining an offense, that a person
fails to perceive a substantial and unjustifiable risk that the result
will occur or that the circumstance exists. The risk must be of such
nature and degree that the failure to perceive it constitutes a gross
deviation from the standard of care that a reasonable person would
observe in the situation.
There are two imaginable meanings of "this paragraph". One is that is just refers to
(a) "Intentionally" or "with the intent to" means, with respect to a
result or to conduct described by a statute defining an offense, that
a person's objective is to cause that result or to engage in that
conduct.
The other possibility is that is refers to the entire sequence of text each part headed by a lower-case letter. We can reject the narrow scope reading of "this paragraph" because the other three paragraphs are necessary in order to actually define what "10" ("10" is apparently a subsection – the first division of the section is into numerical parts, i.e. sub-sections).
This bill was enacted in 2022, and you can compare the enacted bull with the current ARS, which is about a particular section. Both versions refer to "subsection B" and "paragraph 5". This allows us to conclude that subsections have capital letter designators, paragraphs (which are subordinate to subsections) have Arabic number designators. There does not seem to be any official name for the lowest-level designators (a), (b), (c)...
In Arizona, as in Washington, permanent laws that are enacted then get codified into the "Revised Code" or "Revised Statutes". This process changes "which" to "that" and adds or deleted sections or subsections (etc), and is typically what people see when they read about a law. RCW 9.12.010 originated at least in 1854 on p 92, §91 (the first session of the territorial legislature), but this is already-codified law and I have no idea whether there is a record of what the legislature initially enacted. At any rate, the current Title-Chapter-Section scheme (title 9, chapter 12, section 010) has been adopted for a long time in Washington. In case it matters (and sometimes it does), the courts will look at the enrolled bill and not the revised statutes to understand what the law says.