Table 3. Onomatopoeias associated with the action of knocking across languages.

Language	Action	Onomatopoeia
Spanish	Golpear	tok
Italian	Bussare	tok
French	Frapper	tok
English	To knock	nok
German	Klopfen	klopf
Polish	Pukak	puk
Japanese	Takete	kon
Dutch	Kloppen	klop
Hungarian	kopogtato	kop
Bulgarian	bluskam	chuk
Thai	kor	kok

The listed onomatopoeias were recorded from native speakers (we use approximate English pronunciations). Notably, the consonant is present in every language in either context or for the vowels and . Many other examples of the knock onomatopoeia are available on the Internet, for instance at the wikipedia , where very few exceptions to this rule are reported. It is interesting to note that some languages allow the onomatopoeic sounds to permeate into related nouns and verbs, while in others they are completely different. It has been suggested that onomatopoeias, which are mainly monosyllabic, are more permeable to languages with the same predominance, as the case of English.