This page is designed to help people who intend to use Unicode encoding for scripts containing combinations of basic characters with diacritics. It will help them to find out whether a given combination is encoded in Unicode 2.1 as a "precomposed character" or not, and if not, whether it has been stored in the TITUS collection of diacritic combinations not present in Unicode.
Below, you will find tables of Latin, Greek, Cyrillic, and Georgian characters together with tables containing diacritics that might be used in combination with them. By clicking

• first on one of the basic characters,
• then on at least one of the diacritics shown,

you will cause a script to check whether the combination you chose is encoded in Unicode or whether it has been stored in the TITUS collection. The result will appear either in the bottom frame of this window (if your browser is able to display frames) or in an extra window.
If you intend to check a combination containing of more than one diacritic, please be sure to click the diacritics in the order recommended by Unicode, viz. starting with the one which is nearest to the top of the basic character, continuing upward with superscript diacritics, then starting with the one which is nearest to the bottom of the basic character and continuing downward with subscript diacritics.
If the combination you entered is present in Unicode 2.1 or in the TITUS collection, the result will be displayed in the following form:

The diagram contains the following information:

• :
  The combination you chose, encoded as a precomposed character. If the character is displayed in green, it is not encoded as such in Unicode 2.1 but is included in the TITUS collection. In this case it will only be displayable if you have installed the TITUS Unicode font.
• E425:
  The Unicode number (in hexadecimal form) of the precomposed character. If the number begins with E or F, the character is not part of Unicode 2.1 proper but treated as part of the "user definable area" within Unicode. In this case, the number is proposed by TITUS for further treatment.
• 58405:
  The same number as above, in decimal form.
• "LATIN SMALL LETTER A WITH DOUBLE ACUTE ABOVE":
  The name of the combination you chose. If the combination is not present in Unicode 2.1, this will be a name proposed by TITUS for further treatment.
• 0061+030B:
  The respective Unicode numbers (in hexadecimal form) of the basic character and the diacritic(s) involved.
• a̋:
  The combination you chose, encoded as a sequence of the basic character and the diacritic(s) contained. According to the prescriptions of Unicode, the placement of the diacritic(s) should be as correct as in a precomposed character, but this effect is not guaranteed by any operating system that can handle Unicode encoding nowadays. The combination may only be displayed with all its part if you have installed the TITUS Unicode font. Please note that some diacritics are not present in Unicode as such.

If the combination you entered is not present in either Unicode 2.1 nor in the TITUS collection, an error message will appear instead. In near future, this will be substituted by a form where you can enter detailed information about the character you checked, in case you want this character to be stored in the TITUS collection for further treatment, esp. with respect to providing a proposal for a Unicode extension.