XIAO-4

('xiao' in the fourth tone)

There are 49 standard Chinese characters with a 'xiao' pronunciation. Important sound-indicating components are: 肖 (9 occurences), 交 (5)

效 = effect

有效 = you(3)xiao(4) = effective, valid

Inscription on Chinese railway tickets:

在3日内至有效 = Zai(4) san(1) ri(4) nei(4)dao(4) you(3)xiao(4) = Valid within three days