What does the MLB 150 Patch stand for?

Rawlings Adult Patch Logo T-Shirt, Baseball Apparel

After reading many people complain about the Patch on the jerseys this season it was hard not to notice the patch during games my Graphic Design mind took over and thought these

MLB 150: All 30 MLB Teams to Wear Jersey Patch in 2019 – SportsLogos.Net News

St. Louis CITY SC on Instagram: It took over two years to construct CITYPARK, but our city – along with our partners @purina and @bjc_healthcare – has been building toward this moment

Say hello to Halo Blue, the Rocket City Trash Pandas' new uniform

Twins making careful decision about ad patches on players' jerseys

Mlb Patch