indexkaart

An indexkaart is a small card used to record and organize information. The term is Dutch for an index card and can refer to both library cards and personal note cards. Traditionally made of sturdy paper or light cardstock, indexkaarten come in various sizes, with common formats including about 3×5 inches (approximately 7.6×12.7 cm) and 9×14 cm.

In libraries and archives, indexkaarten played a central role in card catalogs. Each card contained bibliographic data such as author, title, subject headings, call number, and location, and was filed in drawers or racks organized by author, subject, or title. These cards enabled researchers to locate items before the widespread adoption of online catalogs. Many institutions now limit or retire physical card catalogs, but some still maintain them for special collections or historical interest.

Beyond libraries, indexkaarten are widely used as study aids and for organizing notes. They allow users to record single ideas, citations, or facts on individual cards and to rearrange them to reflect relationships or build an outline. Cards may be blank, ruled, or preformatted, and often include spaces for a source or page number. Holes for binders or rings are common in some sets. In education and research, the format remains a practical, portable method for compiling information, drafting arguments, and supporting memory through tactile handling.