You can travel in Europe with a < 6cm blade pocket knife on your person or in your carryon.
The rule actually states that the following IS NOT permitted in hand luggage:
"Knife (with a sharp or pointed blade and/or blade longer than 6cm)"
Bit confusing.
Ryanair in Italy spell it out more clearly
@Stonehedge started
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You can travel in Europe with a < 6cm blade pocket knife on your person or in your carryon.