Pieces of eight?

• White and black pawns, e.g
• Series of eight
• Quarterfinal groups
• Candles in a menorah, e.g.
• Wild coast hiding first sign of danger for boat crews?
• Groups of eights
• Pairs of quartets
• Quarterfinal groups, e.g.

Wiktionary Word definitions in Wiktionary
n. (plural of octad English)