ankh
Synonym discussion
Sense: noun/1
All three names point to the same hieroglyph, but the choice of word signals where the speaker is standing. 'Ankh' is the everyday English word and what most readers will recognise; it works in textbooks, museum labels, news articles about Egyptian exhibitions, and casual talk about jewellery or tattoos. 'Crux ansata' is Latin and feels scholarly; you meet it in art history papers, older European writings, and formal catalogues, where the writer wants a neutral, technical label. 'Key of life' is a nickname that became popular through new-age, esoteric, and jewellery contexts, and it gently shifts the focus from the symbol's shape to its spiritual meaning. So a Cairo museum guide says 'ankh', a 19th-century French scholar writes 'crux ansata', and an online jewellery shop sells a 'key of life' pendant.
Etymology
Borrowed in the 19th century from Ancient Egyptian 'ꜥnḫ', meaning 'life' or 'to live'. The hieroglyph itself shows a looped cross and was read with the same sound. English took the word in through Egyptology, the new field that grew after Napoleon's expedition to Egypt and the deciphering of the Rosetta Stone, when scholars needed names for the symbols they were now able to read.