This will be a very concise contribution. The mantra YESH comes from the Jewish personal name Yeshua (Jesus). It represents wholeness, strengthening, amplification, harmony, and development.
A special feature is that the vowel E must be pronounced here as a close-mid front vowel, the so-called “narrow e” (IPA symbol: [e]). English does not have this sound. In German, it can be found for example in the word See, and in French in the word été. You can listen to the pronunciation of this sound on Wikipedia.
That’s it.
