One thousand billion (1,000,000,000,000 or 1012).
For example EUR 123 trillion = EUR 123,000,000,000,000.
Sometimes abbreviated to 'trn' or 'tn'.
Historically in the UK and some other countries, 'trillion' used to refer mathematically to 1,000,000,000,000,000,000 (or 1018).
This historical usage never became established in finance, and is now defunct for practical finance purposes.