Aroon Oscillator is a good indicator used in forex technical analysis by many traders. This indicator can helps to define if the trading instrument is trending or not and if the trend is strong.

Aroon indicator and oscillator developed by Tushar Chande in 1995. “Aroon” is translated from Sanskrit as “Dawn’s Early Light” and Chande called the indicator as it is allegedly the beginning of a new trend.

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From Investopedia
A trend indicator that used the following aspects Aroon indicator ( “Aroon-up” and “Aroon-down”) to measure the strength of a current trend and the likelihood that it will continue. The Aroon oscillator is calculated by subtracting Aroon of Aroon. Readings above zero indicate that an upward trend exists, while readings below zero indicate that a downward trend exists. (full article)

From Traderslog
The Aroon Oscillator measures the strength of a trend. It is constructed by subtracting Aroon Down from Aroon Up. The Aroon Oscillator oscillates between -100 and +100 with zero as the center line. It signals an uptrend if it is moving towards its upper limit and a downtrend when it is moving towards the lower limit. The closer the Aroon Oscillator value is to either extreme the stronger the trend is. (full article)

From Forexrealm
The Aroon is an indicator system which helps to define if the trading instrument is trending or not and if the trend is strong. (full article)