Greek letters and formulas

Equations on a blackboard

A blackboard was a flat vertical surface used for writing on with chalk. Classrooms often contained blackboards. (TOS: "Miri")

Professor James Moriarty's lair included a blackboard. (TNG: "Elementary, Dear Data")

In 2367, to Geordi La Forge's amazement, a hologram of Albert Einstein wrote equations on a blackboard as Reginald Barclay looked on and offered suggestions. (TNG: "The Nth Degree")

In 2375, a chalk-drawn plan of Vic's lounge was used to plan the elimination of Frankie Eyes and his henchmen. (DS9: "Badda-Bing, Badda-Bang")

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