The phrase "not coin" isn't a standard expression on its own, so its meaning depends on the context. However, here are a few possible interpretations:

1. Literal Meaning:

"Not coin" could simply mean "not a coin", i.e., the object being referred to is not a coin (not money, not a round metallic currency).

2. Figurative or Slang Usage:

In some contexts, "coin" is slang for money. So "not coin" might mean:

Not money (e.g., worthless or not valuable)

Not profitable (e.g., “That job is not coin” = That job doesn’t pay well)

3. Typo or Abbreviation:

It could be a typo or shorthand for something else—like a mistaken input for "not coining" (i.e., not inventing or creating a new term), or a truncated thought.