Linked from
The 8 pages that link to Strangeness, each with the reason it gives.
Baryon numberCompared with: Unlike baryon number, strangeness can change in weak interactions.
Strange quarkRelated: It tracks strange-quark content in reactions and decays.
HyperonRelated: It tracks the strange-quark content that defines hyperons.
Neutral kaonRelated: Particle and antiparticle kaon states carry opposite strangeness before mixing.