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2,500-year-old slate containing drawings of battle scenes and paleo-alphabet discovered in Spain
(www.livescience.com)
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Sorry for using a bit more "technical" term unnecessarily; I could've simply said "letter" instead. That said:
A grapheme is the smallest unit capable of conveying meaning in a writing system. In an alphabet, that typically includes the letters plus di/tri/polygraphs; for example in the English version of the Latin alphabet ⟨s⟩, ⟨h⟩ and ⟨sh⟩ are three different graphemes.