Bottom four-dot fire radical — the side-form of
火 used when fire sits beneath a character. Indexes
熙 in the heat-and-light family with
热 hot,
烈 fierce,
然 to burn,
煮 to boil. Carries the 'bright, glowing' image:
熙 originally pictured fire warming and brightening a wide hall, giving the meanings 'bright,' 'genial,' and 'flourishing.'