• 灰色はいいろ — gray
• 石灰せっかい — lime (mineral)
• 火山灰かざんばい — volcanic ash
• 灰皿はいざら — ashtray

The character combines 火ひ (fire) and a simplified version of 又 (hand/again), indicating something touched or left by fire — “ash.” It appears in scientific contexts (volcanology, chemistry) and poetic imagery.