The rule of twelfths is a common method used in navigation for estimating the tidal range. However, there are a few synonyms you may come across in marine literature. For example, the "twelfths rule" or the "twelfth system" are the most common alternatives. Additionally, some texts may refer to it as the "approximation method," as it involves using a series of approximations to estimate the tidal range at different times of day. Regardless of the terminology used, the rule of twelfths is a useful tool for seafarers to have in their toolkit. It allows for quick and accurate tidal range estimation, which is essential for safe navigation.