A beautifully balanced symmetrical section of modules that can be repurposed in a multitude of long-worded scenarios.

2

Gluon.

A hypothetical massless subatomic particle believed to transmit the force binding quarks together in a hadron.

4

Hadron.

A hadron is a composite particle made of quarks held together by the strong force in a similar way as molecules are held together by the electromagnetic force.