So while goofing off going through the smart baby alphabet flash cards we came to 'Transverse Wave'.
We kinda knew what it was but planned to google it later, then while we were looking at the picture Princess pointed out the symbol between the two peaks of the wave. 'that's a Lambda!' (the lowercase one looks like a lambs hut)
Err why yes it is. Greek letters pop up in all sorts of odd places!
BTW we did check wiki, and I still don't really understand what a transverse wave is, though I can spout the definition. So yeah I kinda know what it is.
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