The spelling of the word "is strike" may seem confusing, but it can be easily explained using IPA phonetic transcription. The word "is" is pronounced as /ɪz/, which is a voiced alveolar sibilant sound. This is followed by the word "strike," which is pronounced as /straɪk/, with a long vowel sound /aɪ/ and a voiceless alveolar plosive /k/. So when pronounced together, "is strike" is pronounced as /ɪz straɪk/. Remembering these phonetic sounds can help in correctly spelling and pronouncing the word "is strike."
The term "is strike" does not have an established etymology as it is not a recognized word or phrase in the English language. It appears to be a combination of the verb "is" and the noun "strike", neither of which are directly related. However, if you are referring to the word "strike" on its own, the etymology of "strike" can be traced back to Old English, where it was derived from the Proto-Germanic word "strikōną".