ISO 18405:2017定义了水下声学领域使用的术语和表达，包括自然、生物和人为（即人造）声音。它包括水下声音的产生、传播和接收，以及在海底（或海底）、海面和生物有机体等水下环境中的散射（包括反射）。它还包括水声对水下环境、人类和水生生物影响的各个方面。不包括水声系统的特性。

ISO 18405:2017 defines terms and expressions used in the field of underwater acoustics, including natural, biological and anthropogenic (i.e. man-made) sound. It includes the generation, propagation and reception of underwater sound and its scattering, including reflection, in the underwater environment including the seabed (or sea bottom), sea surface and biological organisms. It also includes all aspects of the effects of underwater sound on the underwater environment, humans and aquatic life. The properties of underwater acoustical systems are excluded.