On a string instrument, position is the relative location of the hand on the instrument's neck, indicated by ordinal numbers (e.g., 3rd). Fingering, independent of position, is indicated by numbers, 1-4. Different positions on the same string are reached through shifting.
With experience, string players become accustomed to the required shape and position of the left hand. Some positions are located relative to certain touch references, or landmarks on the instrument. For example, fourth position on the cello (used in the example below) has the player's thumb resting in the "saddle" of the neck root. Similarly, higher positions on the violin make use of the instrument's "shoulder" (treble-side edge of the top's upper bout) as a touch reference. Some electric string instruments, without a traditionally shaped body, still incorporate a reference feature imitating that shoulder's shape.