赫 is rarely used alone. Common compounds: 显赫 (illustrious), 赫赫有名 (very famous), 赫然 (impressively). Also used in transliterated names like 赫尔辛基 (Helsinki).
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赫 has two 赤 (red) radicals — doubly red, doubly brilliant and prominent.
Left 赤 — the indexing radical, original meaning red/crimson. The picture is of a great fire blazing red. Doubling 赤 here intensifies the brightness, the same way 林 doubles 木 to make 'forest.'
Right 赤 — duplicates the left, doubling the red intensity. Two flames side by side give the meaning of glowing, awe-inspiring brilliance. The reduplication mirrors compound chars like 炎 (flame, fire+fire) and 棘 (thorn, thorn+thorn).
