In short

S4 are a simple, logical way of writing the sounds of English.

S4 are an optimised sub-set of the academic International Phonetic Alphabet (IPA) symbols.

There is an IPA symbol for every sound that you can make with your mouth. The S4 set is limited to the sounds used in standard English speech.

Click the link below to see the list.

S4 Wall Chart

 

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