The Esc key is read as the full word "escape" /ɪˈskeɪp/ — two syllables, stress on the second, even though it is abbreviated "Esc" on the keycap. So "press escape", "hit escape to cancel." Do not spell it out as "E-S-C" or say "esk." It is the ordinary English word "escape." The abbreviation is only a label; spoken, it is the whole word.
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How is the "Ctrl" key name pronounced?
The Ctrl key is read as the full word "control" /kənˈtroʊl/ — two syllables, stress on the second, despite the vowel-less "Ctrl" abbreviation on the key. So "press control C", "hold control." Do not spell it out or try to pronounce the consonant cluster "ctrl." The abbreviation just drops the vowels for space; aloud you say the complete word "control."
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How is the "Win" / Windows key or the "Alt" key handled — how is "Alt" pronounced?
The Alt key is read as one syllable "alt" /ɔːlt/ (or /ælt/) — pronounced as a short word, not the full "alternate" and not spelled out. So "press alt-tab", "hold alt." It rhymes with "salt" (or "shalt"). This contrasts with Ctrl and Esc, which are said as their full words; "Alt" is conventionally clipped to the short syllable "alt." Do not say "A-L-T" letter by letter.
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How is "PgDn" / the page keys handled — how do you say "PgUp"?
The PgUp key is read as the two full words "page up" /peɪdʒ ʌp/, and "PgDn" as "page down." The keycap abbreviates them, but aloud you say the complete words. So "press page up", "scroll with page down." Do not spell it out or blend it into "pug-up." Similarly "Del" is read "delete," "Ins" is "insert," and "PrtSc" is "print screen."
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How is the "Enter" / "Return" key referred to, and how is "Tab" pronounced?
The Tab key is said "tab" /tæb/ — one syllable, short /æ/ vowel as in "cat," exactly like the word "tab" (a label, or a browser tab). So "press tab", "tab to the next field." Do not spell it out. The Enter/Return key is read as the full words "enter" /ˈɛntər/ or "return" /rɪˈtɜːrn/. All of these are spoken as words, not letters.