"Hard currency" is a term that refers to a currency that is widely accepted and traded in the global market. It is considered a stable and valuable currency that is often used as a reserve currency, and is often preferred by foreign investors and traders. Some synonyms for "hard currency" include "strong currency", "stable currency", "valuable currency", "sound currency", and "reserve currency". These terms describe currencies that are considered reliable and trustworthy, with a low risk of depreciation or devaluation. Examples of hard currencies include the US dollar, the Euro, the British Pound, the Japanese Yen, and the Swiss Franc.