古

adjective: old, ancient
古, 古老

The character 古 carries several senses under the same reading gou2 — a general adjective sense 'old/ancient' and a separate Cantonese/Hakka/Southern-Min-specific noun sense meaning 'story' (as in 講古 'to tell a story') — and it is unclear which sense this single-character headword is meant to target.