The spelling of "Jack Stringer" follows the standard English rules for phonetic transcription. The word "Jack" is spelled using the letters J-A-C-K (/dʒæk/), representing the phonemes /dʒ/ and /æk/. "Stringer" is spelled using S-T-R-I-N-G-E-R (/ˈstrɪŋər/), representing the phonemes /s/, /t/, /r/, /ɪ/, /ŋ/, and /ər/. Together, the two words form a proper noun, indicating a specific individual or entity with the name Jack Stringer, spelled according to the standard English phonetic rules.
There is no widely recognized or established etymology for the term "jack stringer". It seems to be a relatively obscure term, and there is very limited information available about its origin or meaning. Without any specific context or reference, it is difficult to provide a more precise answer. It is possible that "jack stringer" may be a personal or local name, a regional slang, or domain-specific terminology.