A small handbook or manual, especially one that is practical and easy to carry.
From Greek enkheirídion, meaning literally 'something in hand.' The term emerged from Greek philosophical tradition and became popular in Medieval Latin for religious and secular instruction manuals.
Epictetus's Enchiridion, written around 100 AD, is still read today as a pocket-sized wisdom manual—it's wild that a 2,000-year-old book survived partly because it was actually portable and practical!
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