On a standard QWERTY computer keyboard, the numeric key 7 serves a dual purpose depending on whether you press it alone or hold down the Shift key. When pressed by itself, it types the numerical digit 7. However, when you press and hold the Shift key while striking the 7 key, it outputs the ampersand symbol (&), which is commonly referred to as the "and" sign. On physical phone keypads or calculator number pads, the 7 key is simply a dedicated numeric digit representing seven, and it is traditionally associated with the letters P, Q, R, and S on older mobile telephone keypads used for predictive text messaging before the invention of modern touchscreen smartphones.
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