i. Hyphens join words whose elements combine to give a single, compound sense, such as:
pre-emptive strike bias-free language Judaeo-Christian ethics
ii. En dashes join words which retain their separate meanings, such as:
Jewish–Christian dialogue
En dashes should also be used to indicate a range of page numbers, dates or biblical chapters and verses. Note that, for page numbers only, the second number in a range is shortened where appropriate down to two digits (but not to one digit for numbers greater than 10); but the second number of the range is not shortened if the first ends in a zero:
pp. 65–68, 100–102, 201–2, 309–56, 462–68
AD 154–157 502–500 BC 1951–1952
Psalms 1–2; 89 Rom 1:1–2:11 Ezek 16:1–5, 30–33
iii. Em dashes are used to mark strong disjunctions. They are not spaced:
“Take three—and only three—samples.”