That which rides the wind, interprets the Tibetan word 'Lungta', which is used to describe the kind of horizontal prayer flags as these. This is derived from the practical function of the lungta flags of being raised in the sky and moved by the wind.
The word lungta is composed of two syllables: the first, lung, represents the element 'space' in the fivefold classification of the elements 'earth, water, fire, air and space' and signifies 'universal foundation' or 'omnipervasiveness'. The second syllable ta (horse) refers to the 'excellent horse', and since in ancient times in Tibet the horse was the symbol of traveling with the greatest speed, in this case it seems to refer to the transmutation of every thing that depends on the five elements from negative to positive, from bad to good, from misfortune to good fortune, from baleful portents to auspicious signs, from poverty to prosperity, and it implies that this should ensue with the greatest speed.
The mantras that roughly translate to these are precisely what are written on the flags, and when jet stream winds blow in the high Himalayas, these prayers are carried far and wide.