'non-callable' originates from the prefix 'non-' meaning 'not' and the word 'callable' which comes from the verb 'call', meaning 'to summon or bring back'.

'callable' transformed from the Old English word 'ceallian', and eventually became the modern English word 'call'.

Initially, 'callable' meant 'able to be called', but in financial contexts, it evolved to mean 'able to be redeemed before maturity'. 'Non-callable' negates this ability.