BTC D. is the ratio between the market cap of Bitcoin to the rest of the cryptocurrency market.

BTC : Alts

What does it mean when Bitcoin Dominance goes up?

When the price and dominance of BTC are rising, it could signal a potential bitcoin bull market.

Since Bitcoin is the oldest and most dominant cryptocurrency, it tends to absorb market information faster. It also reacts much quicker than the altcoins, triggering a change in Bitcoin Dominance without any significant altcoin price movement. Therefore, if the investors are quick enough to spot these movements in Bitcoin Dominance, it can help make them smart and profit trades.