In typography, overstrike is a method of printing characters that are missing from the printer's character set. The character was created by placing one character on another one — for example, overstriking "L" with "-" resulted in printing a "Ł" (L with stroke) character.
The ASCII code supports six different diacritics. These are: grave accent, tilde, acute accent (approximated by the apostrophe), diaeresis (double quote), cedilla (comma), and circumflex accent. Each is typed by typing the preceding character, then backspace, and then the 'related character', which is `, ~, ', ", , or ^, respectively for the above-mentioned accents.
With the wide adoption of Unicode (especially UTF-8, which supports a much larger number of characters in different writing systems), this technique is of little use today. However, combining characters such as diacritics are still used to depict characters which cannot be shown otherwise.
Many font renderers in computer programs invent missing bold characters by overstriking the normal character with itself, slightly horizontally offset. The horizontal offset is essential since, unlike a typewriter where repeating a letter in exactly the same space will make it darker, most modern printers will not darken repeated "strikes" to the same space. Actual bold fonts are designed with some features thicker and others the same size as a regular font, so the use of this "fake bold" is considered undesirable from a typographic point of view.
The character set for the APL programming language includes several characters that were printed by overstriking other characters on printing terminals such as the IBM 2741, for example the functions ⌽ and ⊖ may be used to reverse the elements of an array.
WordPerfect word processing program included an overstrike functionality.
Word and LibreOffice do not.
No known keyboard arrangement includes a function key that allows any two characters to be superimposed.
to run or walk with an overly long stride
to stride (or to stand) over something
to excel or surpass
An overly long stride.
To striking. 16th c.
To cover up (a design, mark etc.) by stamping another on top of it; to superimpose a mark or logo on (a coin, stamp, etc.). from 20th c.
To strike (something) too hard. from 20th c.
A coin that has been overstruck, i.e. coined more than once. from 20th c.
The printing of one character over another, as - on top of L to produce Ł. from 20th c.
overtype (feature where input replaces existing characters instead of being inserted before them)
To stride over or beyond.
To strike beyond.