Which insignia represents an E-2 in the Marine Corps?

The insignia that represents an E-2 in the Marine Corps is one chevron up. In the rank structure of the Marine Corps, the E-2 rank is known as Private First Class (PFC). This rank is denoted by a single upward-pointing chevron, which symbolizes the first level of advancement for enlisted personnel after the initial rank of Private (E-1). This designation helps to clearly distinguish the PFC from the lower rank of Private, characterized by a lack of any insignia.

The designations for other ranks involve additional chevrons or different insignia, but for an E-2, the simplicity of one chevron up effectively communicates the rank and authority of a Private First Class in the Marines.