| X's and O's were upper-case letters, 4.0 mm high and 2.0 mm wide. |
| They might not know their upper-case letters from their lower, but today's online activists certainly know how to disrupt the enemy. |
| A good password, regardless of whether it's for mail or the web space, comprises a combination of numbers as well as upper-case and lower-case letters so that an ordinary word is not formed. |
| Case-sensitive pangrams are difficult to design because, in normal writing, lower-case letters far outnumber upper-case. |
| There are warnings against the use of all upper-case text as this impacts negatively on readability. |
| Maximum of 20 characters limited to upper-case letters A to Z, digits 0 to 9, parenthesis, dash and forward slash. |
