According to Paolo Ardoino (@paoloardoino), the unique 21 million Bitcoin supply cap, aligned with the 21st Century and represented as 'XXI', underscores scarcity as a core value driver for Bitcoin in crypto markets. This symbolic representation is increasingly referenced by traders and analysts to highlight Bitcoin’s fixed supply in trading strategies, potentially influencing long-term holding behavior and price stability (source: Paolo Ardoino on Twitter, April 26, 2025).