Tetrachords
From bib. source
Notice also that the major scale can be thought of as two identical, four-note patterns separated by a whole step. These four note patterns are called tetrachords.
To understand this, the Major scale refers to the following: 
The middle whole step is what separates the pattern of four pitches (or notes) within the given scale or mode. These patterns of four pitches (or notes) in scales, separated by a middle interval, are called tetrachords (Kostka, Payne, and Almén 2018, 5).
major_scale music music_theory musical_scale musical_mode pitch note tetrachords musical_modes pitch scales whole_step whole-step whole_tone whole-tone
bibliography
- “Fundamentals.” 2018. In Tonal Harmony: With an Introduction to Post-Tonal Music, by Stefan Kostka, Dorothy Payne, and Byron Almén, 8th ed., 1–65. New York: McGrawHill Education.