I think you need to replace "sign" with "symbol" for it to make any sense
(1 year, 3 months ago)
plod
Playing to a diminishing crowd : (
(1 year, 3 months ago)
Sid Kneebridge
Good grid.
(1 year, 3 months ago)
troemyd
Ditto prince comment, but also I don't think all those words are strictly onamatapoeia - for instance, 'Ahh' is just the written interpretation of the sound, not quite the same.