The meaning of 2-5-1

If deducting stitches of 2-5-1
How many stitches should be deducted?
Totally deducting 5 stitches?
Or every two rows deducting 5 stitches=totally deducting 10 stitches?
So confusing…

Welcome to the forum!
What is the name of your pattern?
If you think it will help you can quote part of the section this appears in. Don’t give us a large portion of the pattern please due to designer copyright.
If this is a Japanese pattern it means to bind off 5sts every 2 rows once. It would be a decrease of 10sts. But maybe this is a pattern from another country?

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Thanks for answering my question.
In fact the pattern is the vest cuff position.
When I start to knit this position,the instruction
shows deducting stitches 2-5-1, and then 2-2-2 and 2-1-2. I understand last two “formula” but confusing the first one.

And is it a Japanese pattern? I’ve seen different assignments for these x-y-z designations in different sources.

I see this pattern from the website of China

Ah, perhaps the same kind of notation. See if the decrease of 10sts makes sense with the stitch numbers.