Blocks do not overlap. A block may contain code points that are reserved, not-assigned etc. Each character that "is" assigned, has a single "block name" value from the 308 names assigned as of Unicode version 13.0 Unassigned code points outside of an existing block, have the default value "No_block". Each assigned character can have a single value for its "Script" property, signifying to which script it belongs. The value is a four-letter code in the range Aaaa-Zzzz, as available in ISO 15924, which is mapped to a writing system. Apart from when describing the background and usage of a script, Unicode does not use a connection between a "script" and "languages" that use that script. So "Hebrew" refers to the Hebrew script, not to the Hebrew language. The special code Zyyy for "Common" allows a single value for a character that is used in multiple scripts. The code Zinh "Inherited script", used for combining characters and certain other special-purpose code points, indicates that a character "inherits" its script identity from the character with which it is combined. (Unicode formerly used the private code Qaai for this purpose.) The code Zzzz "Unknown" is used for all characters that do not belong to a script (i.e. the default value), such as symbols and formatting characters. Overall, characters of a single script can be scattered over multiple blocks, like Latin characters. And the other way around too: multiple scripts can be present is a single block, e.g. block Letterlike Symbols contains characters from the Latin, Greek and Common scripts. When the Script is "" (blank), according to Unicode the character does not belong to a script. This pertains to symbols, because the existing ISO script codes "Zmth" (Mathematical notation), "Zsym" (Symbol), and "Zsye" (Symbol, emoji variant) are not used in Unicode. The "Script" property is also blank for code points that are not a typographic character like controls, substitutes, and private use code points. If there is a specific script alias name in ISO 15924, it is used in the character name: , and . Decompositions, decomposition type, canonical combining class, composition exclusions, and more. Age is the version of the Standard in which the code point was first designated. The version number is shortened to the numbering major.minor, although there more detailed version numbers are used: versions 4.0.0 and 4.0.1 both are named 4.0 as Age.