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Although mostly many users use to type lowercase letters, why does all keyboard is printed with uppercase letters.

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marked as duplicate by Evil Closet Monkey, Charles Wesley, greenforest, Joshua Barron, Kit Grose Jun 11 at 23:17

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2 Answers 2

up vote 6 down vote accepted

I guess it's because uppercase letters are both more distinctive and recognizable. Compare, for example, lowercase 'i' vs 'l' and 'I' vs 'L'. It has no effect for power users but important for newbies I believe.

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3  
And yet, many children's early learning keyboards have lower case letters on! For example these images on Google –  Roger Attrill Jun 9 at 10:01
    
@RogerAttrill interesting, maybe it's because children have to train to recognize lowercase letters more than uppercase so it's a kind of training too. –  alexeypegov Jun 9 at 10:12
    
Thank you guys. –  Mohammed Hussain Jun 9 at 10:37
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Alexeypegov: May not be so much about more training needed. It may be more to do with how we teach children to read: that always starts with lowercase letters. The famous "leesplank" (board used in reading lessons), avoided the distinguishability problem by not having words that mixed characters that are hard to distinguish from each other. @RogerAttrill –  Marjan Venema Jun 9 at 11:37

I believe it's partly alexeypegov's answer of distinctiveness, but also historical reasons. The first typewriters, which also had the first QWERTY keyboard, only supported upper case letters.

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