详

Left speech radical — the indexing radical in its 2-stroke side form. Marks 详 as a verbal act: explaining in detail, going over things thoroughly with words. Anchors it in the speech family with 说 (say), 论 (discuss), 议 (deliberate), 谈 (chat) — and most directly with 详细 (detailed) and 详尽 (exhaustive).

Right side 羊 supplies the sound — yáng shifted to xiáng through an onset alternation that also gives 祥 (auspicious), 翔 (soar), 洋 (ocean). The 'sheep' meaning is unused here; this is a clean phonetic-only role. A useful mnemonic: 详 is speech laid out as patiently as counting a flock of sheep one by one.