Punctuation

This is a set of rules for punctuation that should be kept in mind when writing content for HELIO HMIs, the HELIO IDE, and the HELIO Docs.

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Commas

Serial commas

»Items in a series are normally separated by commas (but see 6.64). When a conjunction joins the last two elements in a series of three or more, a comma—known as the serial or series comma or the Oxford comma—should appear before the conjunction. Chicago strongly recommends this widely practiced usage, since it prevents ambiguity. If the last element consists of a pair joined by and, the pair should still be preceded by a serial comma and the first and.«

Source: The Chicago Manual of Style > 6: Punctuation > 6.19: Serial commas

Do

To apply consistency use these rules for headlines, bullets, and punctuation.

Don't!

To apply consistency use these rules for headlines, bullets and punctuation.

Dashes & Hyphens

Hyphens and the various dashes all have their specific appearance and uses. The hyphen, the en dash, and the em dash are the most commonly used. The differences can be subtle, especially between an en dash and a hyphen, but using them correctly shows that you're precise and careful.

Source: The Chicago Manual of Style > 6: Punctuation > 6.79: Hyphens and dashes compared

Name	Preview	Used For	Example	Keyboard Shortcut on macOS
hyphen	-	Compound words Separate numbers that are not inclusive, such as telephone numbers or ISBNs	fire-roasted tomatoes 978-0-226-15906-5 (ISBN)	-
en dash	–	Display ranges	Monday–Friday 1–100	option + -
em dash	—	Separate extra information or mark a break in a sentence	A notebook, pen, and laptop—these were all in my welcome kit!	⇧ + option + -

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