I found this perplexing: >"LHR/GMT¥8: the arrival airport, LHR, which is in the GMT time zone, which is 8 hours ahead of the origin airport" Why exactly is th

I found this perplexing: >"LHR/GMT¥8: the arrival airport, LHR, which is in the GMT time zone, which is 8 hours ahead of the origin airport" Why exactly is the Yen sign used at the destination? Why would this not warrant an explanation?