There's a gray area when it comes to grey vs. gray (pun intended). Here's where the difference comes from and when to use each.
Grey vs Gray: How Do You Spell This Color?
Correct and incorrect checkmarks grey icon. Right and wrong tick sign Stock Vector Image & Art - Alamy
Reader's Digest
Doesn't understand there are two correct spellings of gray/grey : r/facepalm
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English. Как правильно по-английски: grey или gray (и дело не только в британско-американских различиях), English - The ELN Zen Channel - Английский
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Gray or Grey: what's the right spelling? - Writer