ATH (All-Time High)
Highest historical price of an asset.
ATH = psychological barrier. Distance to ATH shows cycle phase: -80% accumulation, -50% bull correction, +0% euphoria, +50% above = parabolic. Post-ATH correction 30-50%, in bear 70-90%.
In plain words
Highest price a coin has ever hit. A psychological barrier: below it people think about buying, above it about selling. BTC -80% below ATH is typically a bear bottom. +30% above ATH is euphoria, time for caution.
Example
BTC ATH Nov 2021: 69k. Year later 15.5k (-77% = bear bottom). March 2024: new ATH 73.7k. ETH ATH 4891 (2021), still below in 2026.
Also known as: all-time high, historical high, rekord cenowy