LSD was the abbreviation for £:s:d, pounds, shillings and pence; otherwise known as 'old money': the pre-decimal coinage of the UK until 1971.
LSD is an abbreviation of the Latin words libra, solidus and denarius.
- Libra, a pound weight in Latin,
- s. is an abbreviation for shilling in English,
- d. stands for denarius or denarii (a Roman coin)