Line

1. Genealogy: Ancestral link between two people

• ascending line: tribe to the ancestors
• descending line: lineage to descendants

Modern genealogical research takes into account not only the paternal line but also the maternal line. For dynasties, blood relationship (secondary line) is often important.

2. In mathematics, the line defines a one-dimensional geometric figure with straight (straight), crooked (curve) or kinked course.

3. In metrology, the line was an old German unit of length.

4. Military: Preferred formation of troops in the 18th century, where the soldiers stand side by side. In the 19th century, these were active units in contrast to the state army or reserve.

5. Sport: position of the blade in fencing, in which the tip of the blade, with the arm stretched, is on the valid hitting surface of the opponent is directed. On a chessboard, squares arranged vertically one behind the other are referred to as a line.