The term 'Symbol of Sturdiness' can be represented by two crossword solutions: OAK (3 letters) and OAKTREE (7 letters). The OAK is a species of tree that is known for its strength and durability, making it a fitting symbol of sturdiness. OAK trees are native to the Northern Hemisphere and are found in many different climates, from temperate to tropical. They are also very long-lived, with some specimens living for centuries. The wood of the OAK tree is also highly valued for its strength and resistance to rot, making it a popular choice for furniture and construction.