556d

556d is a designation that can refer to several different items across disparate fields. It has no single, widely accepted meaning outside a specific context.

Electronics and catalogs: In electronics and parts catalogs, alphanumeric codes such as 556 with a letter suffix are common for identifying variants, packaging, or regional versions. A suffix like D is often used by vendors to indicate a particular package style (for example, a DIP or other form) or a circuit variant. Because manufacturers create their own naming schemes, 556d does not uniquely identify a device without the accompanying catalog or datasheet.

Unicode and computing: In character encoding, hexadecimal code points are written as U+556D in the Unicode standard. This code point resides in the CJK Unified Ideographs range and represents a single Han character whose appearance and meaning depend on the font and language context.

Other uses: The string 556d can appear as a product code, inventory label, document identifier, or dataset tag in various organizations. In each case, the exact reference is determined by the surrounding documentation or metadata.