In addition to frequency, which of the following is used to identify amateur radio bands?

In amateur radio, frequency bands are frequently referred to by their approximate wavelength in meters. For example, frequencies near 146 MHz are known as the "2-meter band," and frequencies near 7 MHz are known as the "40-meter band." This naming convention dates back to the early days of radio when equipment was calibrated by measuring the physical length of the waves. Today, it remains a convenient shorthand for hams to quickly identify which part of the spectrum they are operating on. Amateur radio explicitly avoids "channel numbers" because, unlike CB or FRS radio, hams are permitted to tune continuously across their allocated frequency ranges rather than being restricted to predefined, discrete channels.