Metta, or lovingkindness, is one of the Brahma Viharas:Metta and the Other Brahma Viharas
Metta is one of the Four Brahma Viharas.
Brahma in this case has been translated as divine or noble.
The word – as qualified in the path of purification – is meant in the sense of best and immaculate.
This is because being best and immaculate is the best attitude towards beings and those who practise it have immaculate minds like those of the Brahma gods.
Vihara means abiding and living.
And so those who practise these are said to be abiding or living in the divine or noble way.http://www.buddhanet.net/mettab5.htm