What characteristic does "mettle" signify?

"Mettle" signifies the capability to endure difficulties and challenges with resilience and courage. The term is often associated with demonstrating inner strength, determination, and the ability to confront adversity in a steadfast manner. In various contexts, such as sports, leadership, or personal trials, having mettle means that an individual can maintain composure and show perseverance when faced with hardships or obstacles. This characteristic is highly regarded as it showcases not only a person's strength of character but also their ability to rise above challenges and succeed despite them.