BTC usually refers to Bitcoin, the first and largest cryptocurrency by market capitalization.
A few common meanings of BTC:
Bitcoin (BTC) — the cryptocurrency.
BTC ticker — the trading symbol used on exchanges.
In some contexts, BTC can also mean “before the common era” in abbreviations, but that's much less common today.
If you're asking about Bitcoin, I can help with:
Current price and market status
How Bitcoin works
Buying, selling, or storing BTC
Mining
Investment risks and analysis
What would you like to know about BTC?$BTC