Divergence
Price makes a new extreme, the indicator does not: the move is weakening.
Divergence is a disagreement between the direction of price and of an oscillator. Price prints a new high while RSI or MACD sits lower than at the previous one: the move continues but with less force. It is an early sign a trend is running out, not an instruction to trade: a strong trend produces three or four in a row and the first ones take your stop. It becomes workable together with a level, a range boundary or a break of structure.