It's a Pacific Crest Trail pin, popularly known as PCT. This long trail is about 2650 miles (4264 km) and runs from the Mexican border in California and ends in the Washington border of Canada. The small design above the acronym is inspired by the highest point in the hike, Forester Pass.
 
🌎 Grade: A
🌎 Size: 0.82 x 0.75 (wxh) inches | 20.8 x 19 (wxh) mm
🌎 Material: Raised Gold Metal
🌎 Finish: Hard Enamel
🌎 Features: 'PACIFIC CREST TRAIL' imprinted on the back
🌎 Backing: Gold Butterfly Clasp (standard) | Gold Locking Cap Upgrade +$0.75
🌎 Best Used On: shirts, jackets, purses, backpacks, bags, hats, or any other kind of fabrics you can pin on!
🌎 Includes: Tag backing noting the highest point of the trail: Forester Pass
 
Inspiration: We admire the strength of the human spirit for exploration and wanted to especially celebrate those who have taken on these famous long trails (all of it or parts of it) with their own two feet.