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Ryanodine receptor

Calcium channel in sarcoplasmic reticulum that releases calcium.

Also: RyR

Large intracellular Ca2+ channel in sarcoplasmic/endoplasmic reticulum that releases Ca2+ to trigger muscle contraction and intracellular signaling.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Large intracellular Ca2+ channel in sarcoplasmic/endoplasmic reticulum that releases Ca2+ to trigger muscle contraction and intracellular signaling.

Sarcoplasmic reticulum