190405

190405 is a six-digit numeric sequence that can function as an identifier in several domains. Unlike a widely recognized term, it does not correspond to a single, universally defined concept; its meaning depends on context, including date formats, cataloging schemes, or database conventions.

In date notation, 190405 is commonly treated as a compact form of a calendar date when used in the YYMMDD format. Interpreted this way, 19-04-05 would align most naturally with April 5, 2019, in systems that apply a 2000s century pivot. However, because two-digit years lack an unambiguous century, the intended year may vary with the program or organization using the code.

In astronomy, numbers in parentheses such as (190405) are used to designate minor planets (asteroids). The number identifies a specific object in the order of its confirmed observations. The object may also have a personal or official name; otherwise the number remains the primary identifier until naming occurs.

In manufacturing, logistics, and information technology, six-digit sequences like 190405 are commonly used as batch numbers, serial codes, or version tags. They can encode a date or sequence information and support tracking and provenance. Different systems may assign the digits with different segment meanings, and separators are often added for readability.

Because 190405 has no inherent meaning beyond its numeric form, its significance must be derived from the relevant database, discipline, or documentation.