Italic is used:
1. For the names of plaintiff and defendant in the citation of legal causes.
2. In algebraic, geometric, and similar matter to designate unknown quantities, lines, etc.
3. For s. and d. (shilling and pence) following the figures: e.g., 1s. 6d.
4. For specific names in Botany, Zoölogy, and Geology.
5. In medical matter roman is used instead of italic for scientific terms.
6. For names of stars or constellations in astronomical matter.
7. In resolutions for the word Resolved.
In MS. one line drawn beneath a word or sentence signifies that it is to be put in italic.
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