Don't understand the OG from this microbrewery

[thisisjohnbrown]

Pyramid's Outburst says that it has an OG of 20, which I assumed meant 1.020. But that doesn't make any sense to me, if it's an 8.5% ABV brew. Is this another unit of measure that I don't know about, like IBU vs HBU?

 

[grouperdude]

plato?

 

[SlimeyBooger]

Probably 20 Plato, which would be 1.083.

 

[thisisjohnbrown]

Awesome. Thanks!