Omnidirectional range is a term typically used in aviation to refer to a navigational system that allows pilots to determine their position relative to a ground-based transmitter. However, there are several synonyms that can be used to refer to this type of system. One common alternative is VOR (short for VHF omnidirectional range), which specifically refers to a type of omnidirectional range that uses very high frequency radio signals. Other possible synonyms might include NDB (nondirectional beacon), ADF (automatic direction finder), or GNSS (global navigation satellite system). Ultimately, the specific term used to describe this type of navigational aid may vary depending on the context and the type of equipment being used.