The term "sterling" has multiple meanings and can refer to different things depending on its context.
1) In a general sense, sterling is an adjective that describes something of high quality or standard. For example, one might say "the service was top-notch, with excellent food and impeccable sterling."
2) Sterling can also refer to the currency used in the United Kingdom, commonly known as British Pounds (GBP). The symbol for this currency is £, often referred to as a "pound sign" or simply "sterling".
3) In some countries, particularly those of Commonwealth nations such as Australia and New Zealand, sterling can also refer to a unit of measurement used in the construction industry. This unit measures the amount of cement needed for one cubic yard (or meter) of concrete.