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an ISR vs a ISR

Both phrases are incorrect. The correct article to use before the word 'ISR' depends on the pronunciation of the acronym. If the acronym is pronounced as individual letters (i.e., 'I-S-R'), then 'an ISR' is correct. If the acronym is pronounced as a word (i.e., 'iss-er'), then 'a ISR' is correct.

Last updated: March 26, 2024

an ISR

This phrase is incorrect. The article 'an' should be used before acronyms pronounced as individual letters.

Use 'an ISR' when pronouncing the acronym as individual letters ('I-S-R').

a ISR

This phrase is incorrect. The article 'a' should be used before acronyms pronounced as a word.

Use 'a ISR' when pronouncing the acronym as a word ('iss-er').

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