What does this mean?

[hubby11]

I was looking at two knives (Ruike P801s) that seemed identical but for a little triangle symbol on the blade with a number next to it. Any idea what that means?

Thanks,

 

[DrHarmony]

According to Canadian Cutting Edge on you tube, the triangle represents the year of manufacture and the number is the month.
Not sure how the year is distinguished but have noticed different orientation on various other models and some without. Maybe differing factories. CCE mentions the stamp is similar to Sanrenmu factory knives. Searching "Sanrenmu date stamp" will give more info.

 

[justjed]

I have that on my P-108, and P121. It's not on my M105-TZ, or the Jager. My first thought was date code, but it's only on some models, so that kinda threw me....